--- Start of Idrisi List message Idrisi-L: Thanks to all of those that replied to my question regarding reading Landsat7 imagery in Idrisi. What I should have specified was that I am using unprocessed -- level 0R -- data. Below are the responses I got, including one from Stefano Crema at Clark Labs. The most useful one (for me) was from Grant Simpson, Wilfrid Laurier University. Thanks Grant! I am still having the problem that the data are really raw and there seems to be a great deal of pixel shifting. Any suggestions?? -Todd __________________________________ *** Here's the method that I found useful. *** Landsat 7 imagery is stored using Hierarchical Data Format (HDF). With a HDF browser such as SciSpy (http://www.SciSpy.com) you could determine the number of rows and columns. Once determined PARE may be used to access the imagery in Idrisi. This operation was successfully completed with IfWv2. Hope this helps. __________________________________ *** From Michelle Sammut. *** I had your same problem. I have managed to solve it by finding the number of columns and number of rows from another image processing software called MultiSpec. When you open the image with this software it gives you the number of rows and columns. You can download this software from: http://dynamo.ecn.purdue.edu/~biehl/MultiSpec/ The header size is the same as the number of columns. __________________________________ ** If your data are in FAST Format, Idrisi will soon support. *** The Clark Labs is just finishing up a new module that converts Landsat 7 FAST format directly to Idrisi32. Please check the web in the next few weeks. In the mean time you can create a new documentation file (rdc) based on the header file. For bands 1,2,3,4,5, and 7 the header file has a 'HRF.FST' at the end of the file name. For bands 6L and 6H the header file has a 'HTM.FST' at the end of the file name. For band 8 the header file has a 'HPN.FST' at the end of the file name. Depending on the bands needed, open the appropriate header and extract the info needed for the documentation file in Idrisi32. These information are; pixels per line = (Columns) lines per band = (rows) pixel size = (resolution) geometric data map projection = (ref system) (most likely it will be UTM) USGS map zone = (ref system) if ref system is 'UTM' include UTM, ZONE and 'N' or 'S' under ref system. for example UTM-11S ul = ######W #######N (min x) (first number after 'N' or 'S') ul = ######W #######N ####### (max y) (second number after 'N' or 'S') lr = ######W #######N (max x) (first number after 'N' or 'S') lr = ######W #######N ####### (min y) (second number after 'N' or 'S') Bellow is an example of a rdc created from a landsat 7 FAST format header ------------- file format : IDRISI Raster A.1 file title : Band 1 extracted from L71041034_03419990702_B10.fst data type : byte file type : binary columns : 8001 rows : 7201 ref. system : UTM-11S ref. units : m unit dist. : 1.0 min. X : 340800.000 max. X : 580800.000 min. Y : 4038900.000 max. Y : 4254900.000 pos'n error : unknown resolution : 30.00 min. value : 0 max. value : 255 display min : 0 display max : 255 value units : unspecified value error : unknown flag value : none flag def'n : none legend cats : 0 lineage : This file was created by the FastIdris module with the command line: lineage : 1*f:\fast-l71-test\L71041034_03419990702_B10.fst*f:\fast-l71-test\L71041034_ 03419990702_B10.rst ----------------------- The final step is to copy the appropriate band and give it a 'rst' extension. The files have the following end; band1 = b10.fst, band2 = b20.fst, band3 = b30.fst, band4 = b40.fst, band5 = b50.fst, band6L = b61.fst, band6H = b62.fst, band7 = b70.fst, and band7 = b70.fst. __________________________________________________ Todd Albert Byrd Polar Research Center Department of Geography Ohio State University [EMAIL PROTECTED] http://whopper.sbs.ohio-state.edu/grads/talbert/index.html --- End of Idrisi List message IDRISI-L is an unmoderated list. As a service to list users, please post a summary of useful responses to your questions. To post a message to IDRISI-L, send it to [EMAIL PROTECTED] To subscribe to the list, send an email from the address to be subscribed to [EMAIL PROTECTED] with "subscribe" (without quotes) as the first line of the message body. To unsubscribe, do the same, only with "unsubscribe" as the first line of the message body.
