[gdal-dev] updating a HFA image

[Lucena, Ivan]

Limei,

When you do anything to a image file outside ArcGIS and you keep using 
the same file name, remember to delete the .aux files.

Ivan


Limei Ran wrote:
> Hi Frank:
> 
> Thank you for your help.  I worked on the image created by 
> CreateCopy().  It worked.  But, when I looked at the updated file in 
> arcGIS.    It appears to be not updated.
> 
> I used:
> =============
> poBand->RasterIO(GF_Write, 
> c_col1-1,c_row1-1,c_nXSize,c_nYSize,poImage,c_nXSize,c_nYSize,GDT_Byte,0,0)
> poRDataset->FlushCache();
> GDALClose( (GDALDatasetH) poRDataset );
> CPLFree (poImage);
> =============
> 
> Do I need to write the updated band to poRDataset after I use 
> poBand->RasterIO or do something else?  The images are HFA format.
> 
> Thanks,
> 
> Limei
> 
> Frank Warmerdam wrote:
> 
>> Limei Ran wrote:
>>
>>> Hi Frank:
>>>
>>> The original image file was a USGS NLCD landuse image (I think it was 
>>> created in the IMAGINE package).   I used 
>>> poRDataset->GetDriver()->CopyFiles made a copy.  Then, I updated the 
>>> copied file.  I will file a ticket with a small area result.
>>
>>
>> Cool, thanks
>>
>>> For a quick solution, could I translate the image into an EHdr format 
>>> image using gdal_translate and then update it with EHdr format or 
>>> other better format you may suggest for reading a region from the image?
>>
>>
>> That should work, or I presume you could even use the Driver CreateCopy()
>> method to copy the image contents, instead of literally copying all the
>> component files.  This would give you a GDAL generated .img file that
>> should hopefully be more safely updated.
>>
>> Best regards,
> 
> 
> _______________________________________________
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/gdal-dev
> 
>