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Tepelná mapa PSČ (oblasti, ne body)?

JGraupner

S ArcGIS Online teprve začínám a s určitými obtížemi se snažím zvládnout poměrně jednoduchý úkol. Importoval jsem soubor .CSV obsahující pouze PSČ účastníků průzkumu. Když je importuji jako adresy/PSČ, můžu vytvořit tepelnou mapu četnosti jednotlivých PSČ (což chci), ale ArcGIS Online je zobrazuje jako jednotlivé body (nikoli jako celou oblast hranic daného PSČ). Importoval jsem také zazipovaný soubor shapefile s hranicemi PSČ v Chicagu.

Musím tyto vrstvy nebo tabulky nějak sloučit? Jak můžu ArcGIS nastavit tak, aby četnost PSČ zobrazoval jako celé oblasti PSČ, a ne jako body?

Díky!

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deleted-user-qpvAI3Fo0MKR

Just so I understand you clearly -

you're wanting to roll your addresses (which are point data) up into the zip code "boundary" (I use parentheses here because zip codes aren't polygons, they're linear routes). You're then wanting to symbolize your zip code areas with some color scheme to indicate the number of responses, say a light blue-to- dark blue color scheme that looks like this:

Image result for choropleth

If I've understood you correctly, you'll need to add the total number of responses per zip code, and then get these results into a new column in your zip code boundary data, say, call this column TotalResponses or something like this.

Once you've done this, when you bring the results into AGO, you'll be able to symbolize on this field, like this (ignore the Shape__Area, I'm just using this dataset as an example)

Does this help?

JGraupner

Thanks for taking the time. Yes, you are correct in what I want to do. Since I don't have ArcGIS Desktop on my computer though, I'm unsure how to add a column to the Boundary shapefile I downloaded from the City of Chicago's open data portal. Is there a way to do this using excel? (I can download the CSV Boundary file and then add a Total Responses column?)

I thought there might be a shortcut since the Zip Code CSV I uploaded automatically calculated the frequency of each zip code, but like you said, not as polygons.

Thanks again.

JGraupner

Seems like I should be able to "Add Field" to this shapefile when I display the chart, but the drop down menu is not giving me the option. Any ideas about this?

deleted-user-qpvAI3Fo0MKR

In AGO you can add a field to your attribute table a couple different ways. One would be to open the attribute table from within your web map, and then click on the 3 lines here, in the upper left-hand corner of the attribute table, and then select Add Field.

You'll choose the type of field, in your case a Short Integer to store the count of responses per zip code, and you'll name the field.

Then you should be in business.

JGraupner

For some reason, the drop down does not give me the option to "Add field." Only the first 4 options.

deleted-user-qpvAI3Fo0MKR

What type of data is your zip code boundary? In order to be able to add a field it must be a Hosted Feature Service.

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