Latest Contributions by MariaManz

‎06-18-2020

Hello! I am trying to develop a percent density contour on a KDE of shark surfacing events, point data, in the Atlantic Ocean. I know this could have been done using Hawths Analysis Tools, or using GEM to create isopleths, however, I am working with ArcGIS Pro. I was wondering if GEM works with pro, as I have only seen that it stops working with ArcGIS 10.3, and/or if there was a way to create the percent density contour in pro without using Hawths Analysis Tools or GEM. Thanks! Maria

‎05-29-2020

Hi Dan, Thank you again for your help I realized that one of my biggest issues was that I was using unprojected data, which is why I could not solve for a search radius. It is all fixed now and I was able to figure out my units! I ended up using a cell size of 18627. The advice to remove the pacific data as well as switch my method to geodesic helped so much! Thanks!!

‎05-27-2020

I think I am finally getting closer to reasonable results, thank you so much for your help!

‎05-27-2020

Yes, my study area spans from about Canada to the Gulf of Mexico, so it is quite large. I didn't specify a study area because I have such a big study area and there are multiple areas of high density or clusters, I provided an image below, and I thought I read somewhere that in that situation it is better to use the default settings. But thank you for your advice! I'll try to look into ways for estimating cell size and search radius! Thanks again!

‎05-26-2020

Thanks again for your continued help, I think it is starting to become more clear to me. I have attached a screenshot of my input values, where "Full_Mako" is my data set layer that has the lat and long coordinates included. The rest of the input values were automatically generated by GIS, and the option to change the unit area has disappeared? I do not populate the data to anything because each point represents one location, so it is weighted by one. I have also included the output values. Thanks again!

‎05-26-2020

Hi! Thanks for the quick reply, I did look into this and I think the answer I am looking for is in this sentence specifically: "The density at each output raster cell is calculated by adding the values of all the kernel surfaces where they overlay the raster cell center.". I am just. not quite sure how to interpret that. I am new to GIS, and I am not quite sure what they mean by "kernel surfaces" and "raster cell center". Thanks again!

‎05-26-2020

Hello! I am working with shark tagging data, and I am running a kernel density analysis in ArcGIS Pro to determine areas of highest density. My output visually looks correct, however the value outputs are confusing to me. I understand they are the pixel density, but I am wondering how I can translate to the population density of sharks in that area so I can use the numbers as well as the image in my analysis. For example when I run my kernel density in RStudio my output shows that 75% of the population is within a certain area. Any clarification would be very much appreciated!

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Date Last Visited	‎11-11-2020 02:24 AM

My Ideas

Latest Contributions by MariaManz

KDE Percent Density Contour

Re: Kernel Density Value Interpretation

Re: Kernel Density Value Interpretation

Re: Kernel Density Value Interpretation

Re: Kernel Density Value Interpretation

Re: Kernel Density Value Interpretation

Kernel Density Value Interpretation

Kernel Density Value Interpretation