Category: Geographic Information Systems

Using NDVI along with regular RGB and NIR bands for image classification

What are the two types of image classification? Unsupervised and supervised image classification are the two most common approaches. However, object-based classification has gained more popularity because it’s useful for high-resolution data.  How does the unsupervised classification of the image help in geographical analysis? Unsupervised classification They do not define training fields for each land

Converting Route to OSM edge ID list in QGIS?

How do I add OSM to Qgis? Once you used QuickOSM OSM files should have been made known to QGIS and you can use the regular vector layer import: Go to Layer -> Add Layer -> Add Vector Layer… In the source field, select your file and click “Add”. You can select one or more

GDAL 2.4 but the current library version is 2.2

Can you install GDAL with pip? If you try to install GDAL to a python environment with a command like python -m pip install gdal it will initially seem like the installation is going to happen. However, you will receive a message that pip failed to build the python wheel file, then a long, verbose

Using ArcObjects in ArcPy to change map grids in Data Driven Pages

How do I change the scale of a data driven page? Then, after exiting the Setup Data Driven Pages dialog box, set the scale of the Detail Data Frame to the scale you want. If you want different scales for different point features, you need to use a field containing these values and select Data

Using Time Slider and Time Format in ArcMap?

How do you add a slider to a time in Arcgis? In a map with time-aware layers, click the Time Slider widget button on the map to open the widget panel. If your map does not contain time-aware layers, the Time Slider widget will not open. If the time animation of a layer is disabled

What resources can you suggest for making beautiful online Maps or Mapping applications?

How can I make my maps attractive? 6 Easy Ways to Improve Your Maps Think about color. Find Signal within the Noise. Adjust Outlines. Utilize Transparency. Use Size and Color. Find the Largest Value. Apr 12, 2016 What are the 7 components that make a good map? Map Elements. Most maps contain the same common

Data from EPSG dataset in proj format

How do I find my EPSG code? The terrain data is reprojected from their source Coordinate System to the Project Coordinate System. An online database with all coordinate system and its EPSG code can be found online on http://spatialreference.org.Oct 6, 2022 What is EPSG coordinates? Answer. EPSG stands for European Petroleum Survey Group. They publish

Choosing best projection/SRID

How do I choose a projected coordinate system? Your choice of a projected coordinate system depends on many factors, including the part of the world you are mapping, the scale of your map, and the purpose of your map. You want to choose a projected coordinate system in which the places and properties that are

Leaflet printing does not show pins and map is shifted

Why is MAP not showing in leaflet? There are a number of reasons why your map might not be displaying: You have an error in your JavaScript (most likely) – use whichever debugging tool is provided with your browser to verify. you are using Internet Explorer and you have Compatibility mode ON. How do you

Geotagged photographs hosted on website and shared via KML

How to map geotagged photos? Add Geotagged Photos to ArcGIS Online Web Maps Choose the ZIP file. Click the drop-down menu, then choose Photos with Locations. Ensure that the box in front of Publish hosted feature layer from photos with locations is checked off. Assign categories (optional) and add tags. Click Add Item when finished.

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