Category: Geographic Information Systems

Combining attributes from multiple point shapefiles using PyQGIS?

How do I combine two shapefiles with different attributes? Process Click on the Vector menu, Data Management tools, Merge Shapefiles to One Ensure the correct shapefile type is selected (points, lines, or polygons). Select the folder where the two (or more) shapefiles you want to merge are located using the Browse button.   How do

Nested polygons, splitting by smallest to biggest using QGIS

How do you draw boundaries in QGIS? To create a new boundary, you need to first create a vector layer. 1> Select Layer > Create Layer > New Shapefile Layer. Use the Add Feature to create polygons. When you draw a polygon, it will prompt you to enter an id which will be stored as

Reproject an aerial layer in QGIS and then open with ArcEngine?

How do I Reproject a layer in QGIS? Steps for reprojecting a shapefile: Open QGIS 2.0 desktop. From the menu bar choose ‘Layers’ à ‘Add vector layer’. A dialog box opens, browse to the location of the required shapefile and click ‘Open’. A shapefile will be displayed on the workspace and the name of the

Selecting the minimum point in a polygon

What is the minimum point to have a polygon? A polygon must have a minimum of three sides. How do you find a point inside a polygon? Draw a horizontal line to the right of each point and extend it to infinity. Count the number of times the line intersects with polygon edges. A point

Any “standard” or at least popular API for geospatial data?

What are geospatial data standards? Geospatial standards are technical documents that detail interfaces or encodings. Software developers and data producers use these documents to build open interfaces and encodings into their products and services.  What are the 3 types of geospatial data? Vectors and attributes: Descriptive information about a location such as points, lines and

Get state but want country in GeoPy and Nominatim

How to get country name from latitude and longitude in Python? Approach: Import the Geopy module. Initialize Nominatim API to get location from the input string. Get location with geolocator. reverse() function. Now extract the data from the location instance.   How to find location using latitude and longitude in Python? Use the geolocator. reverse()

Unable to save map layer

How do I save a layer in ArcMap? Steps for saving a map layer Right-click the layer name and click Save as Layer File. Type in the name of your new layer file. Optionally choose to save a layer to a previous version of ArcMap using the Save as type drop-down. Click Save. How do

PyQGIS – remove layer from legend

How do I remove a layer from a legend in Qgis? Use the [Add group] button to add a legend group. Use the [plus] and [minus] button to add or remove layers. The [Edit] button is used to edit the layer, groupname or title. How do I edit legend items in Qgis? Quote from video:

Where are the address ranges in OpenStreetMap?

How do I get OpenStreetMap data? Download Directly from OSM Simply go to www.openstreetmap.org and find the area you would like to download data for. Hit the “Export” button and you will see a screen with the Extent of the download appear. You can customize this download as either the “current extent” or manually select

Converting line shapefile into CSV with nodes and links

How do I convert a shapefile to a CSV file? You can convert shapefile in CSV using GIS software also. You just need to open the shapefile as vector layer and save it as CSV. For adding the vector layer tyou need to go to Layer->add vector layer and browse the shapefile. After the right

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