We have a customer who has purchased an extensive library of aerial imagery that is in ECW format. According to the Maptitude help system, ECW format is supported. There is mention of an associated .ERS file that contains the header information.
These aerial photos do not have .ERS files. rather, the header information is built into the file. I confirmed this using a free utility from ER Mapper. Ok, here is the problem. I can open the aerial photo in Maptitude and can successfully add new layers to the map. However, if i try to add an aerial photo to an existing map (the most common use case), the aerial photo will not appear. It shows up in the layer list, but does not display on the map. I have tried turning off every layer except the photo and it doesn't show up. The only way i have been able to get this to work was by doing the following: 1. Opening the image in the ER Mapper header editor to determine the projection (or using the GISDK to query the projection). For the images i was testing, the projection was listed as "NUTM19." I assumed that this meant "Universal Transverse Mercator" in "Zone 19." 2. I explicitly set the projection for the map to be "UTM 19" and then attempted to add the aerial image. This worked successfully. The problem i am having is that this customer is concerned that the workflow is too cumbersome (i.e. having to open the image in another program to determine the projection first and then having to set that projection for the map). They are recent MapInfo converts, which handled these image formats natively. According to the documentation, Maptitude is supposed to automatically lock the projection of the map to be the same as the projection for the image that has been added. This would be fine. I have confirmed that this works properly with other imagery formats (i.e. TIFF and Mr.Sid). However, ECW seems not to work. Is there something that can be done here? I was thinking that the header file may be listing the projection using a code that Maptitude doesn't understand. I would be willing to help the customer update the headers, if this will work. However, i need to know what to update it to. Another nugget of information: Whenever i add an ECW file to the map, i receive the following error message: "Major Axis or Radius = 0 not given. Click OK to continue. Reference Info, lay_map,1070,0." Any help would be greatly appreciated! Thanks. Michael ------------------------ Yahoo! Groups Sponsor --------------------~--> Has someone you know been affected by illness or disease? Network for Good is THE place to support health awareness efforts! http://us.click.yahoo.com/RzSHvD/UOnJAA/79vVAA/C5grlB/TM --------------------------------------------------------------------~-> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Maptitude/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
