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2

Wikipedia will have the high and low points for continents, countries, and all of the states. For cities, it's possible the information may be on Wikipedia or another source. To do it via GIS, bring the contours in and sort them to see the lowest and highest elevations. You can get 10ft contours from the USGS download site. It is possible certain cities ...


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Set environment setting extent=your DEM extent, snap raster = DEM, cell size= one for DEM. Use raster calculator expression: Con("DEM">1500,"DEM) Right click on resulting raster, Source, scroll down to see Mean


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Try this tool box. It has a tool that allows you to create filled contours, from which you can easily work out areas.


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Convert the fishnet to point centroids. Buffer the points by 800m. Zonal Mean with the raster as elevation and the zone as the buffers. I find your approach highly unusual but I am sure you have your reasons.


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Have you considered resampling the raster to the target 800 m resolution instead (possibly using a snap raster) using the Resample or Integrate tools and then converting the raster to points (possibly after applying the slope, curvature or aspect functions)? The result will be a regular grid.


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This is very doable using C++. Some example code is below. You just need to use the correct driver. See here for driver formats. "HFA" is the code for the Erdas imagine (.img) format. GDALDataset *pDS; GDALDriver *pDriver; pDriver = GDALGetDriverManager->getDriverByName("Name of you driver here"); //open the raster in read only mode pDS = ...


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The first thing will be to unzip the OS Terrain 50 zip files to ASC files. You should be able to do this as a batch process (I've forgotten how in Windows). Once you have the individual ASC files probably the easiest thing to do is bring them together in a virtual raster (*.vrt) file: Raster -> Miscellaneous -> Build Virtual Raster (Catalog). Load the ...


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If you do have the 3D Analyst extension, it should work this way: Use the tool 'Interpolate Shape'. This will add a Z coordinate information to your points. Use tool tool 'Add XY coordinates'; this will add the XY and also Z coordinates of each point into the attribute table of the shape.



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