FWIW: I tried converting the gpx files from WGS84 to NAD27 and
using the geotiffs with those tracks under viking. That still
didn't work, even though the gpx transforms looked correct.
That may be because NAD27 uses a different ellipsoid, so converting
coordinates that are in NAD27 but tre
In case script attachment I just mention got scrubbed for
some reason (like you read the digest version of this list)
here is the script in e-mail formatted text:
==Cut Here=
#!/bin/sh
usage () {
/bin/echo "Usage: vikingtfw geotif_file"
FWIW: I tried converting the gpx files from WGS84 to NAD27 and
using the geotiffs with those tracks under viking. That still
didn't work, even though the gpx transforms looked correct.
I have the gpsbabel scripts I used for that if any one is interested.
Basically one has to use gpsbabel to conv
2011/5/14 Greg Troxel :
> The key question is if it's ok to depend on it, which requires anyone
> using viking to have it. But I think most geo software does already.
>
> I am generally in favor of requiring it, but I think we should
> understand/plan a bit better first.
If depending to proj is t
Guilhem Bonnefille writes:
> 2011/5/14 Greg Troxel :
>>
>> I haven't tried geotiff, but I do have DRG images for my region (in
>> NAD27). If you could send a note how you configure that, I'll try it.
>
> I don't know what NAD27 is. AFAIK, currently, viking only support 3
> projections: UTM, Me
One other note on DRGs in case it isn't clear.
When one selects "New GeoRef Map Layer," the tfw
file that listgeo creates is the "World File Parameters" file
specified in the "New GeoRef Map Layer" dialog box.
Also, a bunch of free DRGs seem to be available at:
http://www.mapcruzin.com/usgs-drg-t
2011/5/14 Harry G McGavran Jr :
> Why on earth Viking uses tfw files when the information
> it needs is in the geotiff header I don't know.
> It's hard to believe that code isn't there. But
> listgeo will extract that info from the geotiff file
> and create the tfw file.
Projection support in Vik
To answer Greg's questions specifically, I beilieve
DRGs ARE Geotiffs, so you should be able to follow
the steps I sent. To get the tfw file, you can
use "listgeo -tfw getiff_file_name" and on Ubuntu at
least, listgeo is in the geo-bin package.
Why on earth Viking uses tfw files when the infor
One loads his gpx file with File->Open, and one loads
the geotiff with Layers->New GeoRef Map Layer and selects
the tif and the loads the tfw file for that tif and moves
the Map layer down below the gpx layer in the Layer Name
menu. That displays the track on the map but shifted
by the projection d
2011/5/14 Greg Troxel :
>
> I haven't tried geotiff, but I do have DRG images for my region (in
> NAD27). If you could send a note how you configure that, I'll try it.
I don't know what NAD27 is. AFAIK, currently, viking only support 3
projections: UTM, Mercator and LatLon (I don't have correspo
I haven't tried geotiff, but I do have DRG images for my region (in
NAD27). If you could send a note how you configure that, I'll try it.
I wonder if viking should depend on proj.
pgpTNWHc5IXqh.pgp
Description: PGP signature
It has been since 2009 that I last used viking.
At that time I contributed some magic-scissors patches
that were incorporated into viking.
For various reasons I tried the latest two versions
and had a problem I didn't have with whatever version
was current in 2009.
I use geotiffs in combination
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