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I'd look at the source data for the DEM. Was it a bunch of points and breaklines you interpolated? How much do you want to decrease the elevation by? Is it a constant value across the surface or only in certain areas? If it's the whole surface, and you have the points in a .CSV file or similar, just open it in Excel, subtract from the elevation field ...


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You can create or import routes on bikemap.net. After that, export them as GPX, load the GPX file in geojson.io, and save it as GeoJSON. You can add as many GPX files as you want to a single GeoJSON.


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The following is a rough outline of what you might do. I won't include a great deal of detail, you can research further using these terms and/or ask new more specific questions. Note: you will need to careful of coordinate systems. Firstly that they are the same for your datasets, and second that they use metric (metres) horizontal units (not actually ...


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Subtract the trend surface from the DEM. Linear trend (1st order polynomial) 2nd order polynomial trend Per @radouxju's comment - the trend line can be shifted down to avoid negative values by adding the minimum value. In the Raster Calculator: "DEM" - Trend("DEM") + N Where: N = Minimum raster value In python import arcpy from arcpy.sa import ...


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Not sure about Minecraft but many games use grayscale bitmaps to create height maps. Basically you go take a DEM, convert it to a greyscale bitmap and replace a file in the games file system with it. Some games that I know support this include: Sim City 3000 Instruction on How to do this World In Conflict Instruction on how to do this in WICed Crysis and ...


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As an engineer having worked with GPS satellites, I can give you an explanation- it has to do with how many GPS satellites you are receiving signals from for your readings. There are 24 working satellites in the present Global Positional System and depending upon your location (inside a building, under trees, between tall buildings, etc. you will pick ...


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Zero Altitude is not a fixed number every where on earth at the exact same time. As others have pointed out it is based upon a datum of sea level at a standard atmosphere. A standard atmosphere is a unit of pressure equal to 760 mmHg at 15 degrees C. Additionally, the datum is the mean or average of the oceans surface around the globe based upon the twice ...



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