[gdal-dev] Generate a KML-overlay from a Geotiff file

[Chaitanya kumar CH]

Kat,

Your input image is of 32-bit float type. Whereas KML tiles are supposed to
be png format that should be viewable on browsers.
The corrupted pixels are a result of clipping the float valued pixels to the
range [0,255].

I suggest scaling the pixel values to byte type using the -scale option in
gdal_translate.

On Fri, Oct 28, 2011 at 7:34 PM, katrin eggert
<katrineggert1980 at gmail.com>wrote:

> Hi
> Gdalinfo reproject.tif
>
> Driver: GTiff/GeoTIFF
> Files: reprojected.tif
> Size is 3700, 3500
> Coordinate System is:
> GEOGCS["WGS 84",
>     DATUM["WGS_1984",
>         SPHEROID["WGS 84",6378137,298.257223563,
>             AUTHORITY["EPSG","7030"]],
>         AUTHORITY["EPSG","6326"]],
>     PRIMEM["Greenwich",0],
>     UNIT["degree",0.0174532925199433],
>     AUTHORITY["EPSG","4326"]]
> Origin = (34.001088235352334,-19.571332568602660)
> Pixel Size = (0.000204639356437,-0.000204639356437)
> Metadata:
>   AREA_OR_POINT=Area
> Image Structure Metadata:
>   INTERLEAVE=BAND
> Corner Coordinates:
> Upper Left  (  34.0010882, -19.5713326) ( 34d 0' 3.92"E, 19d34'16.80"S)
> Lower Left  (  34.0010882, -20.2998487) ( 34d 0' 3.92"E, 20d17'59.46"S)
> Upper Right (  34.7715554, -19.5713326) ( 34d46'17.60"E, 19d34'16.80"S)
> Lower Right (  34.7715554, -20.2998487) ( 34d46'17.60"E, 20d17'59.46"S)
> Center      (  34.3863218, -19.9355906) ( 34d23'10.76"E, 19d56' 8.13"S)
> Band 1 Block=3765x1 Type=Float32, ColorInterp=Gray
>
> and gdal2tile
> >python gdal2tiles.py -k /home/user/reprojected.tif  /home/user/gdal2tile
>
>
>
>
>
>
> 2011/10/28 Chaitanya kumar CH <chaitanya.ch at gmail.com>
>
>> Kat,
>>
>> Please provide the whole command you used and the output of gdalinfo on
>> your input file.
>>
>> On Fri, Oct 28, 2011 at 4:34 PM, katrin eggert <
>> katrineggert1980 at gmail.com> wrote:
>>
>>> Hi
>>> I have used gdal2tile.py like this
>>> python gdal2tile.py -k [input] [output] and the tiels that are generated
>>> are nothing to do with the input image. It has changed the image by almost
>>> plotting random values pixels.
>>> Is there any limitation regarding inpu timage (e.g. it must be integer or
>>> something like this)?
>>>
>>> Thanks
>>> Kat
>>>
>>> _______________________________________________
>>> gdal-dev mailing list
>>> gdal-dev at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>>>
>>
>>
>>
>> --
>> Best regards,
>> Chaitanya kumar CH.
>>
>> +91-9494447584
>> 17.2416N 80.1426E
>>
>
>


-- 
Best regards,
Chaitanya kumar CH.

+91-9494447584
17.2416N 80.1426E
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