How To Create A Polygon In Qgis

Type it in the console. Find many contributors. Prepare your features in which sampling will occur. shp and create a new field named. Hit OK to start. 2 introduced a gradient fill style for polygons, which included linear, radial and conical gradients. Note that if the output layer uses a temporary layer, it will not be saved with the QGIS. Output options: A shapefile or KML file with vector features. As a bit of background, QGIS 2. Select the record of the polygon that you want to clip the raster to. Browse to where you want to save the output shapefile and click OK. Steps to create a new shapefile layer on QGIS QGIS supports three types of features. This way, you can get that color separation in your maps. Step 1: Creating your Shapefile. Why do you have only 3 records? You can see more polygons on the screen. This dataset needs some improvements, and this blog post will show you how to do merge polygons in QGIS. The coordinates are already in the proper sequence for creating polygons… now, create a column called Path, then generate a sequential number starting from 1 until you get to the bottom of the data. Your CSV should now be added to the QGIS interface as points. I would like to use data from my own country, Norway. Click the "clip" button in the image analysis toolbar. For example, you can use census_wake_2000_points loaded into SpatiaLite with the geometry field called geom. Saving a selection as a new file is a fairly straighforward process. Essentially performing spatial queries for features within the layer. Expand or shrink existing compartment. How to crop large polygons in QGis 1. QGIS 3 goes above and beyond expectations for cartography. dxf file then QGIS was used to convert that. When it asks if you want to add it to the current display, select Yes. Is there not a plug-in or some other way to get the area of a polygon simply by right clicking the polygon? The answers provided end up with a new field attribute (i. In the following figure the back ground polygon is the convex hull generated for the street network shape file. Note: To avoid confusion on later steps, go to the Layers Panel in the bottom left corner and remove the polygon from QGIS that we where using thus far. Right click on the layer. Left-click once for every vertex you want to add to the current polygon, then right-click to finish drawing the polygon. The QGIS provides a number of plugins when you are working with polygons. The QGIS tool allowing to view 3D objects in a web browser interested me enough that I decided to try it out. I'm using a fresh-out-of-SVN of Qgis 1. They allow you to define a layer as the result of an SQL query involving any number of other vector layers that QGIS is able to open. To use an existing polygon for the shape of the hole, click Trace on the Editor toolbar palette, click edge of the feature you want to use to cut, and trace around it. The command doesn't seem to be accessible from the menus and only available as a tool bar item in the Advanced Digitizing tool bar palette. Add the shapefile to the ArcMap, then start. Launch QGIS; Load the data layer. The latest QGIS development build (1. You can use basic Single Symbol style with the Size Assistant in the Data Defined Override, or you can use the Graduated style and choose Size as the method of gradation. There is a collection of plugins ready to be used, available to download. Open the boundary file’s Layer Properties dialogue, and join the CSV file. Editing must be enabled. Import your tasks to your PyBossa project. Intermediate GIS with QGIS and PostGIS by >>>> based >>>>> on the number of points. 0 still lacks this feature that would be really a big improvement for digitizing. The new version of Saga GIS 2. org ) - This desktop GIS software has a QGIS OSM Plugin allowing you to open OSM files and save them to shapefile note: OSM-Plugin only loads information from 8 keys and cuts values at 82 chars. How QGIS compares with commercial offerings. Choose the sampling strategy. The municipality polygons include the sea areas, which makes it harder for people to recognize the shapes, as we're used to see Norway with all its fjords and islands. To create the translation, in the project settings, there is an option to generate the. The QGIS tool allowing to view 3D objects in a web browser interested me enough that I decided to try it out. This can be done by creating a new shp file –polygon. Re: How to Make a project layer editable Hi Tom, in QGIS you can only edit layers, when they are stored in the data formats shapefile, SpatialLite, PostGIS or other databanks. Gordon Luckett shows how to get QGIS up and running on your computer and create maps with vector and raster data. js in my new blog series from Foldøy island. Select browse to find the shapefile map file, and select open. Thanks this saves a lot of time and you don't end up with a lot of useless files. Figure 1 shows the polyline and polygon from the code above. To show and hide the drawing object use hide and show method. Make sure that cell size for new raster is small enough that even narrowest sections of a polygon get represented. Plus, learn how to stylize maps, get more insights from data with overlays and heat maps, and publish results with powerful Python-driven plugins for QGIS. Import the polygon of your study area. QGIS Tutorial 05 - How To Create Line Layers, and QGIS Tutorial 04 - How To work with multiple layer QGIS tutorial 03 - How To Split and Merge Polygons QGIS Tutorial 02 - How To Create Polygon Layer and QGIS tutorial 01 - How To Create Layer and Add poi Download and setup Latest version of QGIS Desktop January (2). However, I can't imagine how it could be possible to make a general solution for making both 2 and 3 look good at the same without cutting the long segment at the marked place. In other words, how to create a polygon layer based on point coordinates? Let's explore some ways to do this in QGIS. Using menus at top of screen select LAYER -> Add Vector Layer. What I am getting now are coordinates in meters. shp and create a new field named. …So double click on that. Drawing lines, points or polygons (vectors) in QGIS Open the georeferenced image ( Layer > Add Raster Layer) or WMS layer ( Layer > Add WMS Layer) Select Layer > New > New Shapefile Layer to create the new empty layer for your vector feature. NO_SIMPLIFY — The edge of the polygons will conform exactly to the input raster's cell edges. These are all ways i would approach this, its nothing perfect but better than nothing. The Processing algorithm Count points in polygon does the same thing, but we want to do the task without using it. QGIS How to create a polygon, cut it and merge. With QGIS you can access up-to-date OSM data whenever you want, select the tags you want to include, and easily export it into an easy-to-use SQLite database or Shapefile. Click on the polygon feature that you want to move, and drag it to a new position, then release the mouse; The entire polygon will be "nudged" to the new position, without having touched the relative positions of any vertices that make up the boundary. Open the boundary file’s Layer Properties dialogue, and join the CSV file. QGIS Basics 03 - How To Split and Merge Polygons Reviewed by world on February 06, 2019 Rating: 5 QGIS Basics 03 - How To Split and Merge Polygons This Video will show how to Split and Merge Polygons. Open the attribute table for the Union_Lk_Rd. When the user opens a project, QGIS checks for a. Visualize your results. Consider this problem. If you wish to map certain points of interest, routes, or polygons but cannot find a shapefile, you can create your own. Add the shapefile to the ArcMap, then start. We are almost done with our work on QGIS. Start editing mode and select polygons you want to work on (you can select all polygons). I am using ArcGIS 10. Strengths: Offers a wide range of input and output image formats. The map-making toolbar controls are on the top left-hand-side of the map. Beautiful Watershed Polygons in QGIS As the title sugests I am showing you, how to create beautiful watershed polygons. We use this blog and Twitter to inform you about the latest news about GIS, Geodata and Geospatial Software & Services. How to crop large polygons in QGis 1. This is taken from a legal document defining a piece of land. , soils, vegetation, or ownership polygons). So I have taken the task of preparing a step-by-step slideshow illustrating how to create a polygon layer inclusive of setting the map projection and updating its attribute table. This dataset needs some improvements, and this blog post will show you how to do merge polygons in QGIS. This exercise uses the above method as it applies directly in QGIS. Why do you have only 3 records? You can see more polygons on the screen. Choose the sampling strategy. Hit OK to start. This example is based on creating a new shape file that includes 2. Enrich your GIS data and make more effective maps with QGIS. Visualize your results. In ArcToolbox, navigate to Data Management Tools > Feature Class > Create Feature Class. Hover over the buttons to see what their function is. In Topology Rule Settings window, select Road for the first layer, then select rule must not overlap with and select Building for the second layer. Ellipses, lines of bearing, pie wedges, donuts, arc wedges, multi-sided polygons, stars, ellipse roses, hypocycloids, polyfoils, epicycloids, and hearts can be created from parameters in the layer data or from default parameters in the Create Shapes tool. Simply navigate to the location of your shapefile. For example, to create a square building, you would digitize the four corners, using any combination of methods for creating vertices or segments. In the following figure the back ground polygon is the convex hull generated for the street network shape file. This post explains the details of how to add a shapefile to the QGIS canvas. This is a part of our QGIS Tutorial for Beginner series. Or create series of points on polygon, add buffer to them, produce line from intersection of polygons from buffer. qm file laying in the same folder like the. I really like the effect, but to create it I had to save the grid itself as a new file, dissolve it and then symbolise it. Draw polygons. , soils, vegetation, or ownership polygons). at crowcrafting. So if you want to edit your layer, you first have to save as shapefile or import to a databank. In QGIS, the data need to be the data same type (i. js in my new blog series from Foldøy island. So far I have been able to import this into Qgis as points. The municipality polygons include the sea areas, which makes it harder for people to recognize the shapes, as we're used to see Norway with all its fjords and islands. Select the polygon layer as the Input layer. Also the ability to rotate polygons and lines after creation. Your CSV should now be added to the QGIS interface as points. Export your results. 2 and I need to create an area to form a polygon shapefile using a latitude and a longitude, not using python as I am just a beginner. 0 with the Split Feature command. This post explains the details of how to add a shapefile to the QGIS canvas. …Make sure you choose the UTM…zone 10 coordinate system and. The upgrade to QGIS 3. You need to load a vector layer of points with a numeric ID indicating order, and an identifier of unique lines or polygons that is shared between points of the same geometry. button to finish Drawing and create the Polygon, turning it into a Solid, Colored image. In a layer containing zip codes, we want to find all neighboring zip codes for every polygon. I really like the effect, but to create it I had to save the grid itself as a new file, dissolve it and then symbolise it. These are all ways i would approach this, its nothing perfect but better than nothing. Create a pybossa project (e. Note that all plug-ins mentioned below are either part of the QGIS core, or can be downloaded with the plug-in manager. Free Quantum GIS Add ons for Creating and Editing Polygons. Draw a line from outside of the polygon, then entering the polygon, and finally exiting the polygon. by python packages like fiona or shapely) as lat and lon coordinates in degrees. How To: Create centerlines from polygon features Summary. This is a part of our QGIS Tutorial for Beginner series. Click with the right button of the mouse. The QGIS provides a number of plugins when you are working with polygons. Digitize the inner ring in the end. Thanks to whoever fixed the right-click crash bug one hour after I reported it! I was given a bitmap file representing the new boundaries of regions we are supposed to be working on for a project. We'll just assume a constant building height (otherwise you can use individual heights stored in the attribute table for the respective building). Select Polyline as the Geometry Type. It assumes viewer has already watched the point and line feature tutorials at the 'GIS & GPS Tips and Techniques. But there are some cases where you will need to bulk edit to your polygons. In QGIS, the data need to be the data same type (i. The QGIS tool allowing to view 3D objects in a web browser interested me enough that I decided to try it out. When a visitor clicks on a portion of the image, the clicked coordinates are sent to the server. Start editing mode and select polygons you want to work on (you can select all polygons). Vector layers use the three basic GIS features - lines, points, and polygons - to represent real-world features in digital format. In a layer containing zip codes, we want to find all neighboring zip codes for every polygon. The map-making toolbar controls are on the top left-hand-side of the map. Has an extensive choice of coordinate. This is the default. It will be simplest if the features in which you wish to sample are in their own layer. IDW interpolation menu in QGIS Interpolate your. It runs on Linux, Unix, Mac OSX, Windows and Android and can be downloaded free of charge from qgis. Set the minimum distance between points (optional). Digitize the inner ring in the end. Click on the ‘export color map file’ button, and save the text file to hard drive. When we are finished with our analysis we will "ungroup" polygons in the file, creating a table row for each polygon. Draw a line from outside of the polygon, then entering the polygon, and finally exiting the polygon. Create a shapefile using QGIS by going to the 'Layers' dropdown menu > New > New Shapefile Layer. I'm going to play with the mapping capabilitites of D3. I don't know the answers to these questions, but since there are obviously some people out there looking for this kind of information (and since I know, from experience, that OGR2OGR can be an absolute bugger to get working correctly) here's another post about OGR2OGR anyway… and this time it's about exporting spatial data from SQL Server. Make sure QGIS recognized your mapping variable as a number. shp file; QGIS knows to associate the other files with this to create the full layer. org ) - This desktop GIS software has a QGIS OSM Plugin allowing you to open OSM files and save them to shapefile note: OSM-Plugin only loads information from 8 keys and cuts values at 82 chars. QGIS Tutorial 05 - How To Create Line Layers, and QGIS Tutorial 04 - How To work with multiple layer QGIS tutorial 03 - How To Split and Merge Polygons QGIS Tutorial 02 - How To Create Polygon Layer and QGIS tutorial 01 - How To Create Layer and Add poi Download and setup Latest version of QGIS Desktop January (2). In QGIS, the data need to be the data same type (i. What others are saying QGIS Fill gaps and slivers between polygons Calculate Area See more. Set the minimum distance between points (optional). Split a polygon feature with a digitized line in QGIS It is possible to split a polygon feature by interactively drawing a line over it in QGIS 2. shp file to the qgis canvas. Make sure that cell size for new raster is small enough that even narrowest sections of a polygon get represented. Click on the tool icon. Press Browse button. How to map species distribution polygons in Google maps. south-west of the polygon as the label falls over the call out line:. Create a polygon layer The procedure to create a point or line is the same as a polygon in which the polygon is comparatively the most difficult of the three. Fishnet Grid. Step 1: Creating your Shapefile. Re: How to Make a project layer editable Hi Tom, in QGIS you can only edit layers, when they are stored in the data formats shapefile, SpatialLite, PostGIS or other databanks. On this tutorial, we are going to learn how to create a new shapefile layer on QGIS. This should be a polygon feature class (e. Enrich your GIS data and make more effective maps with QGIS. Here is an example of using the command to create Voronoi or Thiessen polygons from discrete points with some polygon clipping thrown in for aesthetic effects. Polygons can be created from a file that contains the points (Longitude and Latitude) that make up the vertexes of each polygon boundary, and the order in which to draw them. Attribute table of the United States polygon boundaries Step 4 Click Clip Icon. About converting points to lines or polygons. This will create a temporary raster. QGIS Tutorial: How to create Line buffer in QGIS 2017 views. The procedure to create a point or line is the same as a polygon in which the polygon is comparatively the most difficult of the three. We use this blog and Twitter to inform you about the latest news about GIS, Geodata and Geospatial Software & Services. Find many contributors. This post explains the details of how to add a shapefile to the QGIS canvas. Intermediate GIS with QGIS and PostGIS by >>>> based >>>>> on the number of points. Note that all plug-ins mentioned below are either part of the QGIS core, or can be downloaded with the plug-in manager. The QGIS tool allowing to view 3D objects in a web browser interested me enough that I decided to try it out. Look cool and support the QGIS project! Pick your style and favourite color and show your support with our QGIS goodies! Create, edit, visualise, analyse and publish geospatial information on Windows, Mac, Linux, BSD (Android coming soon). Some of the common plugins allow you to count the number of vertices of simple and multi part geometry, calculate the azimuths and distances of selected feature and figures and also the convergence factor, calculate the total sum of all the line lengths of each. For most common applications, the data exists already; but the more particular and specialized the project, the less likely it is that the data will already be available. In other words, how to create a polygon layer based on point coordinates? Let’s explore some ways to do this in QGIS. When working with polygon features, such as streets or rivers, it may be necessary to create a centerline representing the flow of the traffic along the center of a linear geographic feature. Draw polygons. By Søren Zebitz Nielsen, [email protected] core import QgsVectorLayer, QgsField, QgsMapLayerRegistry from PyQt4. QGIS Basics 03 - How To Split and Merge Polygons Reviewed by world on February 06, 2019 Rating: 5 QGIS Basics 03 - How To Split and Merge Polygons This Video will show how to Split and Merge Polygons. 2 and I need to create an area to form a polygon shapefile using a latitude and a longitude, not using python as I am just a beginner. layout:true. Intermediate GIS with QGIS and PostGIS by ADD LAYER > ADD VECTOR LAYER. Virtual layers do not carry data by themselves and can be seen as views to other layers. Select the polygon to be split. Step by step instructions for creating a polygon feature in Quantum GIS. Yesterday I needed to do merge all the polygons in a postgis table, I tried it with the merge tool in qgis and it was not working. This exercise uses the above method as it applies directly in QGIS. Create a shapefile using QGIS by going to the 'Layers' dropdown menu > New > New Shapefile Layer. Consider our Alameda map. A small dialog box will appear and asks you to give a new attribute value. Some of the common plugins allow you to count the number of vertices of simple and multi part geometry, calculate the azimuths and distances of selected feature and figures and also the convergence factor, calculate the total sum of all the line lengths of each. Sometimes with larger datasets, it is useful to extract the small area for the region you are working on. QGIS Tutorial 05 - How To Create Line Layers, and QGIS Tutorial 04 - How To work with multiple layer QGIS tutorial 03 - How To Split and Merge Polygons QGIS Tutorial 02 - How To Create Polygon Layer and QGIS tutorial 01 - How To Create Layer and Add poi Download and setup Latest version of QGIS Desktop January (2). button to finish Drawing and create the Polygon, turning it into a Solid, Colored image. You should read Chapter 4 in the GIS Fundamentals textbook before starting this lab, as the chapter covers the basics of data entry, properties of hardcopy maps, and digitizing mechanics. Save it on a new location. Using menus at top of screen select LAYER -> Add Vector Layer. Note: This works in the same fashion for drawing Lines, and after you click to place a Marker, ArcMap will automatically create it. As a bit of background, QGIS 2. By Søren Zebitz Nielsen, [email protected] The coordinates are already in the proper sequence for creating polygons… now, create a column called Path, then generate a sequential number starting from 1 until you get to the bottom of the data. Step 3 Select Polygon Boundary to Clip To. Fishnet Grid. In Topology Rule Settings window, select Road for the first layer, then select rule must not overlap with and select Building for the second layer. shp for the shapefile geometry data,. We're going to explore the Difference command. When we are finished with our analysis we will "ungroup" polygons in the file, creating a table row for each polygon. Make sure the end vertex snaps to the first one, so you end up with a closed polygon. Simply navigate to the location of your shapefile. Creating Shapefiles - Drawing lines, points or polygons (vectors) in ArcGIS. These plugins can also be installed directly from the QGIS Plugin Manager within the QGIS application. Drawing lines, points or polygons (vectors) in QGIS. …So double click on that. I read "Clip" hole into Shapefile; Create Polygon from holes in polygon ArcGIS; How to fill in a ring polygon in QGIS 2. Your CSV should now be added to the QGIS interface as points. How QGIS compares with commercial offerings. For most common applications, the data exists already; but the more particular and specialized the project, the less likely it is that the data will already be available. Back in the main QGIS window, you will see one feature highlighted in yellow. Select browse to find the shapefile map file, and select open. Attribute table of the United States polygon boundaries Step 4 Click Clip Icon. Note that shapefiles are actually groups of files with different three-letter extensions:. shp file to the qgis canvas. Maptime Boston. Hit OK to start. QGIS How to create a polygon, cut it and merge. org), which is capable of almost any GIS operation I've ever needed, either on its own, or using the various plugins and associated tools. QGIS Basics 02 - How To Create Polygon Layer and Add Polygons Reviewed by world on February 05, 2019 Rating: 5 QGIS Basics 02 - How To Create Polygon Layer and Add Polygons This Video will show how to create a polygon layer and polygon. 0] corresponds to the Tableau technique in the. Drawing lines, points or polygons (vectors) in QGIS Open the georeferenced image ( Layer > Add Raster Layer) or WMS layer ( Layer > Add WMS Layer) Select Layer > New > New Shapefile Layer to create the new empty layer for your vector feature. Step 3 Select Polygon Boundary to Clip To. js in my new blog series from Foldøy island. Input options: Any georeferenced image file or WMS layer containing features you would like to trace. QGIS 3 goes above and beyond expectations for cartography. layout:true. Strengths: Offers a wide range of input and output image formats. Add the shapefile to the ArcMap, then start. …Make sure you choose the UTM…zone 10 coordinate system and. In my last blog post, we improved a dataset containing all municipalities of Norway by merging polygons in QGIS. qgs file, having the same name like the. Import the polygon of your study area. You are ready to convert your image into a shapefile. In this QGIS tutorial I will use a real-life geophysical survey to detail how I use QGIS to create polygon grids, how I orientate them to fit the area of interest and how I export the grid as points to use with a GPS or Total Station system. This tutorial explains the steps involved in creating and editing a shapefile. Sometimes with larger datasets, it is useful to extract the small area for the region you are working on. core import * qgs = QgsApplication([], True) qgs. When you move a label, QGIS tracks the new location using hidden auxiliary storage fields that we'll use to draw the lines. All this took less than 5 mins. Browse to where you want to save the output shapefile and click OK. Fixing polygon geometry errors in QGIS 2. To do this job visually and easily within QGIS, there is now a new algorithm available in QGIS 3. For most common applications, the data exists already; but the more particular and specialized the project, the less likely it is that the data will already be available. 18 Creating proportional symbol maps in QGIS is made very easy in QGIS with two main methods for making them. 2 and I need to create an area to form a polygon shapefile using a latitude and a longitude, not using python as I am just a beginner. Strengths: Offers a wide range of input and output image formats. …Let's try that in QGIS. QGIS includes several tools that make that simple. Creating Clipping Polygon and Clipping Interpolation Surface. In QGIS, we can create vector layers of points, lines, or polygons. The QGIS provides a number of plugins when you are working with polygons. Browse to where you want to save the output shapefile and click OK. QGIS Tutorial: How to create Line buffer in QGIS 2017 views. This will create a temporary raster. Saving a selection as a new file is a fairly straighforward process. This will assist in exactly placing objects on a map. This is the default. Note : To create a Sqlite database , go to QGis Explorer panel, right click on Spatialite, then on Create Database To import your shape file with Voronoï polygons you will use the database Manager: go to Database menu -> DB Manager to open the window of the database manager. by python packages like fiona or shapely) as lat and lon coordinates in degrees. In a previous post (QGIS Trace Edit Tool) I discussed how to use QGIS' trace edit plugin to create a polygon adjacent to an existing polygon while ensuring that it is topologically correct. area) but the value doesn't update if the polygon is changed. The latest QGIS development build (1. How to count points in polygons in QGIS using Python In this task we will use python scripting to count the number of points which lie inside a polygon and store the result in a memory layer. Creating a Shapefile Using the Draw Toolbar Written by Hans Ege Wenger, 02/24/2012 This tutorial will teach you to create a basic polygon shapefile using the Draw Toolbar. Plus, learn how to stylize maps, get more insights from data with overlays and heat maps, and publish results with powerful Python-driven plugins for QGIS. This is a part of our QGIS Tutorial for Beginner series. Also the ability to rotate polygons and lines after creation. Is there not a plug-in or some other way to get the area of a polygon simply by right clicking the polygon? The answers provided end up with a new field attribute (i. Of course you can get more creative in the filter criteria. 2 and I need to create an area to form a polygon shapefile using a latitude and a longitude, not using python as I am just a beginner. These are all ways i would approach this, its nothing perfect but better than nothing. Also the ability to rotate polygons and lines after creation. Add the polygon layer to a new map document and verify that the. twbx [Tableau 9. Note: This works in the same fashion for drawing Lines, and after you click to place a Marker, ArcMap will automatically create it. Open ArcCatalog; Navigate to your project folder; From the menu, click File>New>Shapefile. Create a pybossa project (e. The steps outlined in this GIS video tutorial are: First, choose how you want to select features from your dataset from the menu:. The mapped image is displayed in a browser and linked to the map file. These polygons are one of the input files required for running SpeciesGeoCoder, and they must represent the user-defined operational areas used for biogeographical analyses. Edit vertices. Thanks this saves a lot of time and you don't end up with a lot of useless files. I am a complete novice at QGIS and I have no idea where to even start. With QGIS you can access up-to-date OSM data whenever you want, select the tags you want to include, and easily export it into an easy-to-use SQLite database or Shapefile. QGIS (previously also known as Quantum GIS) is a free (GNU GPL v2) and open source GIS application enabling the user to visualize, manage, edit, analyse data, and compose printable maps. Create Tableau polygons from shapefiles using QGIS Before you follow the steps in this section, the coordinates in your shapefile should already be in the form of decimal latitude and longitude units, specifically using EPSG: 4326, WGS 84. Split Sub Divide polygon layer using QGIS – Shapefile, kml, GeoJson Sub divide or split polygon in multiple parts. This data is then fed into the mapserver and, possibly, TerraGear to create new scenery. Creating Shapefiles - Drawing lines, points or polygons (vectors) in ArcGIS. To do so, open the CSV’s attribute table. QGIS tutorial 01 - How To Create Layer and Add points Reviewed by world on February 04, 2019 Rating: 5 QGIS Tutorial 01 - How To Create Layer and Add points This video explains how to create a layer in QGIS 3. Join 69 other followers. …Let's try that in QGIS. When it asks if you want to add it to the current display, select Yes. The municipality polygons include the sea areas, which makes it harder for people to recognize the shapes, as we're used to see Norway with all its fjords and islands. To add my layer, I select the XXXX. The map file can be either in map format (. These plugins can also be installed directly from the QGIS Plugin Manager within the QGIS application. Have you tried using negative buffer and convert geometry type? Or convert geometry type to polyline and offset (assuming it's regular polygon). QGIS is a special spatial tool, which easily operate with GIS data files such as shapefile, kml or geojson. Add the polygon shapefile to the map.