[FWTools] gdal_translate question

[Travis Kirstine]

What information does gdalinfo provide you?  For ref see
http://www.gdal.org/frmt_various.html#WLD

I did some poking around and I have a world file that might suit your needs:

0.004166666667
0.0000000000
0.0000000000
-0.004166666667
0.0020833333335
89.997916666665

just copy the values to a txt file and rename it the same as the png
with the extension .wld



2008/9/24 ChristinaPSU <mail at drsdatarecovery.com>:
> Hello Travis,
>
> I dont see any "world" files. Not sure what exactly they are. The options
> say:
>
> -srcwin xoff yoff xsize ysize:
> Selects a subwindow from the source image for copying based on pixel/line
> location.
> -projwin ulx uly lrx lry:
> Selects a subwindow from the source image for copying (like -srcwin) but
> with the corners given in georeferenced coordinates.
>
> I guess I can not do latitude/longitude with srcwin? Maybe I can create a
> world file?? Can you give me a bit more help? :)
>
> Thanks,
> Christina
>
>
> ----- Original Message ----- From: "Travis Kirstine"
> <traviskirstine at gmail.com>
> To: "ChristinaPSU" <mail at drsdatarecovery.com>; "FWTools"
> <FWTools at lists.maptools.org>
> Sent: Wednesday, September 24, 2008 1:15 PM
> Subject: Re: [FWTools] gdal_translate question
>
>
>> Christina,
>> Is there a world file for the blue marble png, if not the -projwin
>> option will not work, -srcwin would.
>>
>> 2008/9/24 ChristinaPSU <mail at drsdatarecovery.com>:
>>>
>>> Hello,
>>>
>>> I have downloaded a Blue Marble PNG image from visibleearth.nasa.gov:
>>>
>>> http://visibleearth.nasa.gov/view_detail.php?id=7102
>>>
>>> called:world.topo.bathy.200403.3x21600x21600.C1.png
>>>
>>> its 21600 x 21600 and 347.3MB.
>>> What I want to be able to do is select a tile of that image by giving
>>> gdal_translate lat/long corners and output a jpeg file. I have tried
>>> these
>>> command line parameters:
>>>
>>> gdal_translate -projwin -93.246226 44.892179 -93.195672 44.866816
>>> -outsize
>>> 9424 4728 -of JPEG world.200407.3x21600x21600.C1.png output.jpg
>>>
>>> This generates the following errors:
>>>
>>> Input file size is 21600, 21600
>>> Computed -srcwin -93 44 0 0 from projected window.
>>> Computed -srcwin falls outside raster size of 21600x21600.
>>>
>>> What am I doing wrong?
>>>
>>> Thanks!
>>> Christina
>>>
>>> _______________________________________________
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>>>
>>>
>>
>>
>>
>> --
>> Travis K.
>>
>> Toronto, Canada
>> ------------------------------------------------------------
>> "She knows there's no success like failure
>> And that failure's no success at all."
>> -Bob Dylan-
>> ------------------------------------------------------------
>>
>
>
>



-- 
Travis K.

Toronto, Canada
------------------------------------------------------------
"She knows there's no success like failure
And that failure's no success at all."
-Bob Dylan-
------------------------------------------------------------