Latest Contributions by MatthiasWoerner

‎07-24-2013

Dear Richard, thanks for the hint, but it didn't help. I added a field "Test" and tried some other names, too, but still the function "Calculate Geometry" remains grey. Any other ideas what went wrong? Regards, Matthias

‎07-24-2013

Dear all, In the attribute table of a dbf file I added a field "Area" and wanted to calculate the area value of the features with function "Calculate Geometry". But this function is grey and does not work. What could be the reason for that and what do I have to change? Thanks in advance and kind regards, Matthias

‎02-27-2013

Dear Dan, In fact, you are right. Stupid mistake of me. Now I projected the data and then it worked. Thank you anyway! Matthias

‎02-25-2013

Yes, the red buffers are created with -370 m. When using -375 m or more I get the mesage that it doesn't work. The data is in meters. Please find the two shapefiles attached. Thanks, Matthias

‎02-25-2013

Dear Dan, that is not the point. Some of the polygons in fact have not enough space due to the holes inside. They are skipped and that is OK. But some obviously would have more space (see screenshot). And I wonder why it doesn't work with more than just -370 m buffering distance. Regards, Matthias

‎02-23-2013

Dear Dan, thanks a lot for this hint. The idea is great: 1) Negative Buffering with the half of the diagonal of my rectangle. 2) Spatial Join with input polygons and output polygons. But: It didn't work with the value of half of the diagonal of my rectangle although there obviously would be any more space inside of the input polygons - at least in some of them. By trying with increasing negative buffering distances I found out that it worked until -370 m (I would need -992 m). I got a message that some of the features have been skipped "because a negative or very small distance resulted in no geometry". That wouldn't be a problem as long as I can push it to the limit. But still there are considerable output polygons in 20 of the input polygons but I can't buffer with bigger distance values. Why? Is there any reason or idea about how to outsmart ArcMap? Thanks, Matthias

‎02-22-2013

Dear All, while analysing polygons respective their fitness of size and form to build power plants there I am facing the following problem: I computed Area and Perimeter of the polygons and based on these parameters the Compactness Ratio with the following formula: [Perimeter] / (2 * 3.14159 * Sqr ([Area] / 3.14159)) As I did in other analyses before I wanted to filter the polygons with the lowest compactness (with the highest values of the Compactness Ratio). But due to the fragmented data structure of another layer the polygons are strewn with "holes" (see the attached screenshot, too). This results in rather high values of the Compactness Ratio and makes it really difficult to judge about the fitness of the polygons. In fact I have to figure out those polygons that allow to build plants in the size of 1500m * 1300m. Does anyone have an idea of how to do that without measuring every single polygon? Thanks a lot in advance, Matthias

‎02-15-2013

Hi Chris, ...alright. And By the way: If my upper post was helpful for you, you could make me happy with my first earned ArcGIS Forum Point (http://resources.arcgis.com/en/help/forums-mvp/). Thanks, Matthias

‎02-15-2013

Dear Anthony, that was exactly what I was looking for. Thanks a lot. Regards, Matthias

‎02-15-2013

Hi Chris, Sorry, I'm not sure if I got it right. You have only one shapefile in the TOC? And that contains points? What do you mean with image - your ArcMap file or a loaded image file in the map? But then it would appear in the TOC, too, wouldn't it? If there are several layers loaded and visible in the TOC, you can easily move them up- and downwards there. But I think you know that. Maybe you can clarify a bit or even attach a screenshot. Regards, Matthias

‎02-15-2013

Dear All, in the Field Calculator I want to enter a formula to extract the cube root of a number. How do I write this (in VB or Python)? Thanks in advance, Matthias

‎02-15-2013

Dear Chris, Precision means the total number of digits and Scale means the number of positions after decimal point. So for a number like 42.1 you have to enter 3 as Precision and 1 for Scale. Regards, Matthias

‎02-02-2013

Dear all, within an analysis about resources and power stations I am facing the following problem: In the attached screenshot there are green areas showing where a resource is available. The pink areas show, where a power station generally could be built. Not yet regarded as a location quality criterion is the proximity to existing roads and transmission lines, but I will implement that later. Additionally I would like to make a statement how much of the resource is available within a radius of 50 km. Could anybody help me out with a tool or method to do this? Thanks in advance and kind regards, Matthias

‎02-02-2013

Dear all, a few weeks ago I updated from ArcGIS 10.0 to 10.1. Now recently I noticed a phenomenon several times: When running processes take very long time or even don't work out at all I try to clear the .mxd file from no more required layers. Quite surprised I found out that the file size - instead of decreasing - was even enlarged. What reason might there be for that? Maybe it doesn't have to do with version 10.1 but I just didn't observe it before. Thanks in advance and kind regards, Matthias

‎01-03-2013

Dear Jake, Thanks a lot for your quick answer and the suggestions. Now I used the Times tool (with 100) and the Int tool. Then the Raster To Polygon tool worked. But after this in the polygon layer there were the fields: FID, shape, ID and Gridcode. I suppose that gridcode is equivalent to the former field value (in the raster layer), but am not sure. Should the tool not maintain the original field value? Regards, Matthias

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Date Last Visited	‎11-11-2020 02:23 AM

My Ideas

Latest Contributions by MatthiasWoerner

Re: Calculate Geometry

Calculate Geometry

Re: Judging Polygons regarding Compactness Ratio

Re: Judging Polygons regarding Compactness Ratio

Re: Judging Polygons regarding Compactness Ratio

Re: Judging Polygons regarding Compactness Ratio

Judging Polygons regarding Compactness Ratio

Re: Precision and Scale

Re: Field Calculator - cube root

Re: Precision and Scale

Field Calculator - cube root

Re: Precision and Scale

resources and power stations

mxd file sizes

Re: Pixel Types