[mkgmap-dev] Issues generating DEM

Sat Nov 25 18:44:51 GMT 2017

Hi Andrzej,

there is no predefined size for HGT's. I use 1201-HGT's mixed with 3601'HGT's. It should not to be a problem to use any other size. The only 
restriction is: height==widht.

The memory consumption is a problem. A HGT with 1201x1201 need in memory 1201*1201*4 Byte = 5,5 MB (.NET use for short also 4 byte). 200 HGT's need 
1,1 GB. Hard to estimate is the size for DEM-Data.

The prog is compiled as "any cpu" and "prefer 32-bit". If "prefer 32-bit" not set, run the prog in 64-bit-win as 64-bit-prog and can use more memory. 
But it runs slower. If you self compiled the prog, unset the option and try to use a xml-file BuildDEMFile.exe.config like this:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <runtime>
       <gcAllowVeryLargeObjects enabled="true" />
    </runtime>
</configuration>

But you are allright, downsizesing the HGT's "on the fly" should not to be a problem. Let me a little bit think about that.

Frank

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