[GRASS-user] errors in m.proj

GRASS GRASS user
1

Hello list,

The landsat maps i downloaded are in XY-meters projection. I also downloaded
SRTM-3arc data and those are in LL projection. So when i want to import all
these data in my location database I get errors: projections don't match. I
prefer LL projection so thought: lets use m.proj to convert all XY data to
LL projections. When I do this I get the following error:

Assuming current projection as input, LL WGS84 as output.

input parameters=[+proj=utm +no_defs +zone=32 +a=6378137 +rf=298.257223563
+towgs84=0.000,0.000,0.000 +to_meter=1]

output parameters=[+proj=longlat +towgs84=0.000,0.000,0.000]

input file=[/Users/Reno/Documents/Personal files/Zweefvliegen/Scenery
project/p197r025_7p20000911_z32/p197r025_7t20000911_z32_nn10.tif]
tr: Illegal byte sequence
4d30'40.522"E 0dN 0.000

Then when I tried to convert the SRTM data to XY-meters, I also got the last
line error: tr: Illegal etc.

What did I do wrong?

Then one more thing: I downloaded finished SRTM data from CGIAR. These maps
do cover half the continent :confused:, so the region is not corresponding
to my working region. How can i still use this data?

Hope somebody can help me %-|, still waiting for the book...
Thanks,

Reno
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2

Reno Bladergroen wrote:

The landsat maps i downloaded are in XY-meters projection. I also
downloaded SRTM-3arc data and those are in LL projection. So when
i want to import all these data in my location database I get
errors: projections don't match. I prefer LL projection so
thought: lets use m.proj to convert all XY data to
LL projections. When I do this I get the following error:

Assuming current projection as input, LL WGS84 as output.

input parameters=[+proj=utm +no_defs +zone=32 +a=6378137
+rf=298.257223563
+towgs84=0.000,0.000,0.000 +to_meter=1]

output parameters=[+proj=longlat +towgs84=0.000,0.000,0.000]

input file=[/Users/Reno/Documents/Personal files/Zweefvliegen/Scenery
project/p197r025_7p20000911_z32/p197r025_7t20000911_z32_nn10.tif]
tr: Illegal byte sequence
4d30'40.522"E 0dN 0.000

Then when I tried to convert the SRTM data to XY-meters, I also got
the last line error: tr: Illegal etc.

What did I do wrong?

m.proj is for a list of individual coordinates (like GPS waypoints).

You want r.proj. (pulls map into the current location/mapset, so
import SRTM into UTM location, then in the LL location pull it across
with r.proj)

Then one more thing: I downloaded finished SRTM data from CGIAR.
These maps do cover half the continent :confused:, so the region
is not corresponding to my working region. How can i still use this
data?

If there is coverage overlap use g.region to set bounds. If you need
data which isn't there you'll have to obtain the next tiles from
another source.

Note a single zone UTM projection is only valid east-west for about
half a continent, at the most, and most SRTM data I have seen was
already in lat/lon. Beyond the 6-degree band you get worse and worse
distortion.

still waiting for the book...

See Markus's earlier post today.

Hamish

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