Latest Contributions by CarinaZacharias

‎07-11-2016

Hmm, after doing this and open them in a new map they are displayed slighlty askew (see below). But I will try the tool that involves the distance calculation anyway and see if it works ...

‎07-11-2016

So, just to make sure I do everything right this time: I define projection and reproject raster in my old map. And then I open the data in a new map, but without defining a reference system for the data frame. And then it should (in theory) work?

‎07-11-2016

Okay! And do I need to start a new map for this or should I try it in the old one?

‎07-11-2016

Here are two screen shots:

‎07-08-2016

I am using ArcMap 10. All the rasters are now in UTM North 48. I can provide screen shots on Sunday or Monday of the properties of the layers. @Melita: I didn't know that was possible - that the data frame and layers could have projected coordinate systems, but the coordinates could still be in degrees. What would I do then to solve this?

‎07-08-2016

But I did that ...

‎07-08-2016

oops, I alwys thought the "define projection" tool was the only way to change the projection. This is good to know although sadly it does still not make a difference ...

‎07-08-2016

Hi, thanks for your help. Unfortunately projecting my data to the UTM Zone 48 reference system didn't help. I also made a complete new map, set the reference system to UTM 48, imported the data - still no difference. The distance is still being calculated in degrees. And if I go to the Properties of my raster layers and to Source and look at cell size I see that these are obviously still in degrees. Do you think that could be the problem? Does anybody have any more suggestions?

‎07-08-2016

Okay, I will try, thanks again!

‎07-08-2016

Hi Jake, thanks for the answer! But what confused me was how many different UTM projections there are. If I go to projections in Arc there are many different folders under "UTM". I guess I would go for Asia, since that's where the nature reserve is located that I'm looking at. But even under Asia there are so many that have 48 in it. There is for example "Indian 1954 UTM Zone 48N" or "MONREF 1997 UTM Zone 48N" etc. ... How do I know which one to choose here? Sorry, if this is a stupid question ...

‎07-08-2016

Dear all, I want to do some distance calculations in ArcGIS, but it is always calculating in degrees. I think the only way to make it measure my distances in meters is to change the data and the data frame to an appropriate projection? (I have set the map properties to meters already.) However, I do not know which projection to choose. I am looking at an area that is roughly at 31.0309° N, 103.1831° E. I have read somewhere else that UTM is good, but Arc offers so many different UTM projections that I was lost again. I think the UTM grid should be 48. Is anybody able to suggest a specific coordinate reference system that I can try? Thanks ever so much in advance. Carina

‎07-03-2016

Hi thanks, but my problem is this: In my raster I have the four classes of suitability. The urban areas fall under "unsuitable". However, areas of very high elevation or steep slope etc. are "unsuitable" as well. But now I would like to assign a different resistance value to the urban areas than to the other unsuitable areas. Do you know what I mean? 😕

‎07-03-2016

Hi everyone, I hope I will be able to express comprehensively what I am trying to do. So, I have a raster that shows different areas of habitat suitability for a species - highly suitable, suitable, marginally suitable and unsuitable. I would now like to use the Cost Distance tool to analyse habitat connectivity. This tool needs a source input - this will be my highly suitable habitat - and it needs a resistance layer input. This will be a reverse of my suitability map with the highest resistance values for the unsuitable habitat and the lowest for he highly suitable habitat. So far so good. What I would now like to do is this: I would like to reclassify the unsuitable habitat around cities and villages with a higher resistance value than all the other unsuitable habitat. But I don't know how to do this. I don't think the Reclassify tool has an option for that? I have been thinking about creating an extra polygon feature layer for these areas - but how would I be able to merge this with my raster? Or is there another, smarter way? My knowledge of ArcGIS tools is not sufficient to come up with a good idea, I am afraid ... Thanks very much and kind regards, Carina

‎07-03-2016

Hello everyone, I have done a habitat suitability analysis for giant pandas in Wolong Nature Reserve in China. I also did a sensitivity analysis to see how different parameterisations of habitat characteristics would influence the output. This resulted in a lot of different maps like the ones below. I am now wondering, if there is a way to overlay all these rasters with a tool that will kind of spatially illustrate the likelihood of one area to be highly suitable or suitable or marginally suitable etc. ... I would like to avoid tools that can only compare two maps at a time. Does anybody have any ideas or suggestions? Thanks very much in advance for any help. Cheers, Carina

‎06-21-2016

Thanks a lot for your patience with me, Dan. That was very helpful! I will try to implement your advice tomorrow.

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Latest Contributions by CarinaZacharias

Re: What projection should I use to measure in meters?

Re: What projection should I use to measure in meters?

Re: What projection should I use to measure in meters?

Re: What projection should I use to measure in meters?

Re: What projection should I use to measure in meters?

Re: What projection should I use to measure in meters?

Re: What projection should I use to measure in meters?

Re: What projection should I use to measure in meters?

Re: What projection should I use to measure in meters?

Re: What projection should I use to measure in meters?

What projection should I use to measure in meters?

Re: Reclassify certain parts of a raster layer for use of Cost Distance

Reclassify certain parts of a raster layer for use of Cost Distance

Overlay several rasters for comparison - What tool can I use?

Re: Reclassify Tool does not create all my classes

Make rasters have the same number of columns and r...