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I am fairly new to GIS softwares and this will be my first post here. I'm working with DIVA-GIS and was redirected here. I hope this is the correct place. I am doing a research which involves ecological niche modeling for present and future climate scenarios. However, i am having some urgent problems with creating the .clm files for the predicted future climate. I have downloaded the necessary data from WorldClim. I have followed the instructions from "Ramirez & Bueno, 2009, Working with climate data and niche modeling: Creation of bioclimatic variables", but DIVA GIS doesnt seem to want to create the files. Basically, i open up the "Make CLM files" window in DIVA GIS, and have all the necessary 36 .grd files + the alt.grd required for the operation. I have correctly inserted the prefixes and ticked their boxes. As soon as i press "OK", these boxes automatically uncheck, the 36 files are not split into the "selected files" spaces present in the window, and the program only creates the single climate.cli files. I have found this question being asked on the internet but with no answer. I have no idea how to solve the issue as everything seems to have been done correctly. Does anybody have an idea?

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2 Answers

I ran into the same problem… follow this guide from steps 5 and onwards if you have not already done so. http://www.ccafs-climate.org/downloads/docs/Ramirez_Bueno-Cabrera_2009_tutorial_bcvars_creation.pdf

The EXACT file naming is critical!!! In the upper file prefix window change the prefixes to “tmin_” for Tmin, “tmax_” for Tmax and “prec_” for Precipitation; Then rename each of the 36 files to match the prefix (ie. change tmin10_11.grd -> “tmin_10.grd"). So in the end you should have a folder with 36 grd and 36 gir files (tmin_1.grd, tmin_1.gri, tmin_2.grd, tmin_2.gri, ect. (NOT "tmin1_11.grd").

Another important consideration is file size and storage capacity. If you download and create monthly tmin values for each month at a 1km/1km resolution for the entire planet, Diva-GIS will just freeze out. I would suggest downloading and merging only the tiles you need… then follow steps to convert (BIL - > grd)

http://www.worldclim.org/formats

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If you are using the 7.5 version... leave the "suffix" field blank. That works for me.

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This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post - you can always comment on your own posts, and once you have sufficient reputation you will be able to comment on any post. –  PolyGeo Oct 4 '13 at 23:40
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