[mkgmap-dev] DEM and SRTM hgt files: size too small

Thu Nov 1 09:30:39 GMT 2018

Hi Thorsten,

the program tries to calculate the resolution using this code:
        private int calcRes(long size, String fname) {
                long numVals = (long) Math.sqrt(size/2);
                if (2 * numVals*numVals  == size)
                        return (int) (numVals - 1);
                log.error("file", fname, "has unexpected size", size, "and is ignored");
                return -1;
        }

size is the size of the unzipped file. When you see such a warning it means that the file is not in hgt format.
where you have the same number of shorts in horizontal and vertical direction.
I don't know how to fix your problem, probably something went wrong in the conversion.

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Thorsten Kukuk <kukuk at suse.de>
Gesendet: Donnerstag, 1. November 2018 10:16
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: [mkgmap-dev] DEM and SRTM hgt files: size too small

Hi,

I started to play with maps with DEM, but run into a problem:
viewfinderpanoramas.org provides hgt files, but only for some areas.
The SRTM1v3.0 data is using geotiff. No problem, you can convert them
with gdal_translate and fill the missing areas. Works fine for below N50,
but starting with N50, the data is much smaller and this leads to the
following error:
SEVERE (HGTReader): 71200154.osm.pbf: file /data/OSM/data/hgt/N50E012.hgt has unexpected size 12970802 and is ignored
SEVERE (HGTReader): 71200154.osm.pbf: file /data/OSM/data/hgt/N50E013.hgt has unexpected size 12970802 and is ignored
SEVERE (HGTReader): 71200159.osm.pbf: file /data/OSM/data/hgt/N50E014.hgt has unexpected size 12970802 and is ignored

Any ideas how to solve the problem?

  Thorsten

--
Thorsten Kukuk, Distinguished Engineer, Senior Architect SLES & MicroOS
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nuernberg, Germany
GF: Felix Imendoerffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nuernberg)
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