How to load the .tfw file when opening a .tif file?

[TorbenWiggerich]

Hi,

I have a .tif file and an extra .tfw file. How can I load the .tfw file?

From this post I could see how to load the .tif file:

https://community.esri.com/thread/93016?sr=stream&ru=3159

But how can I go further and load the corresponding .tfw file?

In ArcMap it is automatically done, but not in the ArcGIS Runtime SDK for Qt.

[DanPatterson_Retired]

the *.tfw contains the spatial information for the *.tif file and it is not loaded separately but used by applications to establish the spatial reference of the image if it is used by the application

[TorbenWiggerich]

So this means it is automatically loaded?

When I have a map000.tif and a map000.tfw, lying in the same directory and I load the map000.tif, than the map000.tfw will be automatically loaded?

But I don't see the .tif loaded in my application. (So with another file having already the information inside the tif it will be shown correctly.)

[DanPatterson_Retired]

apparently the thread that you listed suggested that they don't load automatically.  Did you follow the advice in the thread?

[TorbenWiggerich]

Actually I followed the example from this site Raster‌ which was shown in the thread by Eric Bader.

So which advice do you mean? I didn't see any advice there...

[DanPatterson_Retired]

Sorry that is the one...and I guess it didn't work

[TorbenWiggerich]

Hmm...

sorry but which is the advice you mean?

I don't get it

[EricBader]

Hi Torben,

It's possible that the .tfw is not being honored by the Local Server. For example, in similar fashion,  the .prj file of a shapefile is not honored.

If you start with a basemap that has the same spatial reference as your raster, add that basemap layer first to the map, then add your raster, that should help.

In a future release, you will add raster layers to your map in a more "direct read" fashion, so the Local Server will not be needed. The Local Server approach today is very very (did I say very?) limited with respect to dynamically adding ad hoc data sources to your map.

I hope this is helpful!

[TorbenWiggerich]

Hi,

oh sorry, the problem was that the tif was not shown because the 6 lines of the tfw file were not in the desired format. So it was shown only a very small image near the coordinates 0, 0. But the tfw file was loaded, thanks again . Changing the tfw file from the declared Longitude and Latitude to the UTM format worked.

So the problem is that I also need a version which reads the Longitude and Latitude values.

My current question is, what do I need additionally to load these files?

In the method onServiceCreationSuccess I have to change it somehow that the file will be loaded with a longitude and latitude?

[EricBader]

Good to hear that you've identified an issue with this file.

As far as what else you need to do in your code, there isn't anything else required.

Are you able to visualize the raster in your map now?

Keep in mind, the very first layer added to your map is what determines your map's spatial reference.