Skip to main content
Question

Georeferencing and reprojecting issue of tiff files.

  • November 18, 2015
  • 1 reply
  • 57 views
R
I've got two tiff files that I have georeferenced to two different projection systems. This is because the tiffs are of maps of two different dates. I have done this in FME, but also want to project the old tiff into the new projection system. Therefore I need to complete two stages within one FME session:

 

Number 1, Georeference both tiff files into two different coordinate systems.

 

Number 2, Reproject one of the tiff files into the same coordinate projection as the other tiff.

 

This is what I’ve tried to do so far, but the workspace isn’t working and is showing up as blank in the inspector.

 

 

Does anyone know where I am going wrong?

 

1 reply

redgeographics
Celebrity
Forum|alt.badge.img+49
I think you're not getting a black screen in the Inspector but rather it's showing the 2 tiff files in one projection while one of them is actually in a different system with a very different range of coordinates. That way both of them appear really tiny and far apart, giving the appearance of a blank screen. If you draw a selection box in the map view it should still select both rasters.

 

 

My initial guess would be that there's something wrong with the georeferencing and/or reprojection. A few things you can check:

 

  1. View the georeferenced tiff's in the Data Inspector after step 1, but individually. If you set a background map (Tools -> FME Options -> Background Map) DI will attempt to reproject on the fly to the projection of the background map, this allows you to check whether the tiff's are properly georeferenced.
  2. If they are properly georeferenced there's probably something wrong with the reprojection. My personal preference is to use a Reprojector and always specify the source coordinate system (don't use "read from source"), if it's known of course (but I assume it is in this case). So doublecheck those settings. If you view them in the Data Inspector afterwards make sure to switch off the background map so it will not reproject on the fly, this allows you to check whether both of them are in the same system.
Hope this helps.

 

 

Reply


Helpful Members This Week

Community Stats

31,201
Posts
118,277
Replies
38,804
Members

Latest FME

Terms & ConditionsCookie settings

Cookie policy

We use cookies to enhance and personalize your experience. If you accept you agree to our full cookie policy. Learn more about our cookies.

 
Cookie settings
A product of
Safe Software respectfully acknowledges that we live, learn and work on the traditional and unceded territories of the Kwantlen, Katzie, and Semiahmoo First Nations.