Latest Contributions by SpiroKorizis

Scenario: The NYC Department of Health and Mental Hygiene (DOHMH) has tasked you with creating a map of risk of PM2.5 (fine particulate matter) exposure by populations that have asthma. PM2.5 is known to exacerbate various cardio-vascular and respiratory diseases, including asthma. All you are given is the data and you must determine how to use it to create the model. The DOHMH wants a simple first pass at this, so all they want is an additive model at the UHF-level (an aggregate of zip codes) that quantifies the following things: 1) UHF zones with very high concentrations of PM2.5 (greater than 15 mg/m3), 2) UHF zones with somewhat high PM2.5 concentrations (between 14 and 15 mg/m3), 3) UHF zones with very high rates of asthma (prevalence > 6 people with asthma per 100 people) 4) UHF zones with somewhat high asthma rates (between 5.5 and 6 people with asthma per 100 people). These were the instructions. We were also given the weights for the additive model. I already submitted something, which I know isn't correct, but I would like to know how to do this. I have only been using GIS for about 4 months and I decided to take a more advanced course along with an introductory course to graduate sooner. Probably not the smartest idea. I did derive a raster surface for both PM2.5 and asthma layers, reclassified, and did a weighted sum. It didn't come out right, but I don't think the solution is overly complicated. -Spiro ... View more

The boundary file is a polygon, and it is based on the zip codes. This layer can represent areas with "no data" and fill in missing areas, such as airports or parks. ... View more

The zip codes are polygons. They are not my boundary file. I believe the boundary file is a polygon. I am not sure what you mean by unique identifier. I can join the asthma table with some of the other layers if I have to. -Spiro ... View more

Thanks for this. I followed your steps and was able to do what I wanted. ... View more

Thanks. I will keep that in mind for any future inquiries. ... View more

In order to fix the problem, I needed to exclude areas where the population is "0" and then change the classification scheme. I manually changed to ten classifications, with intervals of approximately 5000. It still doesn't look perfect, but the color shows a lot better. ... View more

It looks the same in data view. I turned off all other layers, but still looks the same. I added the layer to a new map document, but still looks the same. I am headed to my class in about an hour, so I will ask the professor what the problem is. I will let you know what the issue was. Anyway, I appreciate the help. ... View more

Yes, I removed the outlines. Transparency is at 0% and "scale symbols when a reference scale is set" is checked. Display expression is "CB2000." Still doesn't look right. I think I need a private tutor ... View more

I figured out how to get rid of the gray, but it still doesn't look right. The darker colors don't appear as dark as they should. ... View more