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I am a beginner with QGIS and need a simple answer here. I have a raster aerial photo and wish to overlay a vector shapefile (I have already created)showing polygons of land use. Please. This must be simple, or do I need to use photoshop? If so some guidance here would also be appreciated...

All, I have a PostGIS/Postgresql DB that has two tables in it. One with point geometries and the other that represents country boundaries as polygons. I would like to add the country name that each point intersects with to each row in my point table. Maybe as one big update query. I think this...

Facebook to track users’ location to be submitted to businesses.. أكثر...

I posted this question on stackoverflow here, but it seems that gis.stackexchange is the more appropriate platform. I am trying to merge two geodataframes in geopandas (want to see which polygon each point is in). The following code gets me an error ("RTreeError: Coordinates must not have...

How can you track location of Santa Claus in a real-time? There are two main tools to do that. The first one, developed by Google, is called*Santa Tracker. It uses Google Maps to show geographic position of Santa as well as his geographic progress around the world. The site detects your location...

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Anybody here can help me regarding calculating Vegetation Condition Index (Kogan,2004) for Landsat?. Specially facing problem in NDVI_max and NDVI_min; which should be maximum and minimum value? أكثر...

I like the way Google Earth displays KML as a "scene graph", that is, a tree structure in the left panel. This allows you to rearrange features in folders, change layer order, etc. via drag-and-drop. However, this (rather useful) functionality is a bit too basic in Google Earth. For...

What mean ''unknown extration'' in print composer. How we can resolve this,for working later in print composer. أكثر...

I have these rasters: DEM Flow Direction Flow Accumulation I would like to calculate the flow distance of every pixel to the outlet of a basin. In Arc-GIS, I can use the flow length. But I don't have access to a license right now. Any other open source way to do it? أكثر...

I'm new to QGIS, indeed fairly new to GIS systems in general.I have been asked to create about 20 small maps for a local historical society. The maps are for walkers to follow various routes passing locations of historic interest.Each of the maps is to show numbered "points of interest" (POIs)...

Our goal is to show/hide individual hatched maps. Unfortunately we have more than the 4 max layers allowed in a viz. We successfully made and example where we show/hide the 4 layers in a viz:http://maps.massgis.state.ma.us/cartodb_test/cartodb_demo_1_viz_show_hide_animals_chkbox_legend.html...

Cameras on a lunar orbiter and some clever image processing techniques led to a new take on a historic image of the Earth and Moon. أكثر...

I have a raster for which I want to find the Cell Location (Row, Col) if I have the Lat-long information. I know how to get the value of a particular cell using lat long. extract(ras,SpatialPoints(cbind(-82.8,35.2))) But I need the row-col of this cell, rather than it's value. I am using the...

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In this video, we’re going to investigate generate slope with a DEM attained from GeoBase. Don’t forget to reclassify your output in a meaningful way. Video contains public sector Datasets made available under the City of Toronto’s Open Data Licence v2.0 and GeoBase® (http://www.geobase.ca/)...

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