[gis_info] gis_info Digest, Vol 214, Issue 3

Thu Dec 3 12:25:35 PST 2020

One solution would be to have a field that calculates percentage of funds
distributed.  That way the choropleth uses the same range for the
percentages but they update each week.  You could then have a scale bar
that displays the overall percentage of funds distributed, and show what
percentage is distributed to each county, sort of how they do with
fundraisers.

On Thu, Dec 3, 2020 at 12:00 PM <gis_info-request at omls.oregon.gov> wrote:

> Send gis_info mailing list submissions to
>         gis_info at omls.oregon.gov
>
> To subscribe or unsubscribe via the World Wide Web, visit
>         https://omls.oregon.gov/mailman/listinfo/gis_info
> or, via email, send a message with subject or body 'help' to
>         gis_info-request at omls.oregon.gov
>
> You can reach the person managing the list at
>         gis_info-owner at omls.oregon.gov
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of gis_info digest..."
>
>
> Today's Topics:
>
>    1. Re: FW: Looking for advice on making an updating choropleth
>       (Darrell Fuhriman)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 3 Dec 2020 09:49:18 -0800
> From: Darrell Fuhriman <darrell at garnix.org>
> To: "=?utf-8?Q?gis=5Finfo=40omls.oregon.gov?="
>         <gis_info at omls.oregon.gov>,  SMITH Cy * DAS <Cy.SMITH at oregon.gov>
> Cc: JOHNSON Nathan * DCBS <Nathan.Johnson at oregon.gov>, VARGAS Antonio
>         R * DCBS <Antonio.R.Vargas at oregon.gov>
> Subject: Re: [gis_info] FW: Looking for advice on making an updating
>         choropleth
> Message-ID: <ce87f62e-f518-4e8c-a923-2de34120d4bc at Spark>
> Content-Type: text/plain; charset="utf-8"
>
> I don?t think there are perfect solutions to this problem, just less bad
> ones. The reality is if you?re looking at an exponential growth situation,
> this is bound to happen. This was exactly the problem that led to the
> argument a few weeks back about Georgia and its COVID case maps changing
> the scale ? people thought they were being misled.
>
> With the surge in COVID cases, the NYT recently had to change the scale on
> its maps, and they had a big caveat to that effect when they did.
>
> I think that?s probably the least bad solution: update it the scale, but
> only occasionally. Make sure there?s a note?right next to the legend?that
> explains when and why the scale has changed. You could do it on an
> as-needed basis (but build yourself some headroom so it?s not happening
> weekly), or on a schedule, like quarterly or annually.
>
> It?s probably also helpful to use a system where the bins are consistent,
> like a linear scale, and you?re just changing the top end of the scale. In
> other words avoid Jenks, which could just compound the confusion if someone
> is looking back at past maps, IMO.
>
> Darrell
> On Dec 3, 2020, 09:29 -0800, SMITH Cy * DAS via gis_info <
> gis_info at omls.oregon.gov>, wrote:
> > Hi folks, we have a question about making good choropleth maps.? See
> below.
> >
> > cy
> >
> > <image001.png>
> > Cy Smith, GISP
> > Enterprise Information Services
> > Data Governance and Transparency|Geospatial Enterprise Office
> > (503)378-6066, http://gis.oregon.gov
> > ?Ensuring user-friendly, reliable and secure state technology systems
> that serve Oregonians.?
> >
> >
> > From: VARGAS Antonio R * DCBS <Antonio.R.Vargas at oregon.gov>
> > Sent: Thursday, December 3, 2020 9:19 AM
> > To: SMITH Cy * DAS <Cy.SMITH at oregon.gov>; TANNER Joshua * DAS <
> Joshua.TANNER at oregon.gov>
> > Cc: JOHNSON Nathan * DCBS <Nathan.Johnson at oregon.gov>
> > Subject: Looking for advice on making an updating choropleth
> >
> > Hello,
> >
> > I was wondering if you or someone on your team could provide some advice
> or a reference to best practices that might help with a project.
> >
> > I?ve been asked to make a choropleth to illustrate dollar amounts going
> to each Oregon county to illustrate the progress of a program. The issue
> I?m having is that leadership would like to update the choropleth with new
> data each week, and I?m not sure how to choose the color scale to
> accommodate that.
> >
> > By the end of its lifespan, the dollar amounts will be roughly an order
> of magnitude higher than at the start. So, when I choose a color scale with
> enough room at the high end to account for this in the future, basically
> every county in today?s map is assigned the lowest colors on the scale. One
> idea we had was to use a continuous color scale, though the colors still
> end up very similar.
> >
> > On the other hand, if I were to update the color scale each time the
> data is updated, so that the data fills the whole color range each time, I
> expect that the colors assigned to each county wouldn?t change much over
> time. I guess the map would look wholly the same each data update, just
> with the legend assigning different dollar amounts to each color.
> >
> > Any advice would be much appreciated.
> >
> > Kind regards,
> >
> > Antonio
> >
> > -----
> >
> > Antonio R. Vargas
> > Research Analyst
> > Division of Financial Regulation
> > Oregon Dept. of Consumer and Business Services
> > Office: 971.345.1106
> >
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: <
> https://omls.oregon.gov/pipermail/gis_info/attachments/20201203/4bb9bb29/attachment-0001.html
> >
>
> ------------------------------
>
> Subject: Digest Footer
>
> _______________________________________________
> gis_info mailing list
> gis_info at omls.oregon.gov
> https://omls.oregon.gov/mailman/listinfo/gis_info
>
>
> ------------------------------
>
> End of gis_info Digest, Vol 214, Issue 3
> ****************************************
>

-- 

*Twenty years from now you will be more disappointed by the things that you
didn't do than by the ones you did do. So throw off the bowlines. Sail away
from the safe harbor. Catch the trade winds in your sails. Explore. Dream.
Discover.*
- Mark Twain
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://omls.oregon.gov/pipermail/gis_info/attachments/20201203/ed0da49b/attachment.html>