topic Re: using arrows to label provinces on map (gmap) in Graphics Programming

using arrows to label provinces on map (gmap)

Anita_n — Mon, 30 Apr 2018 10:24:07 GMT

How can I tell sas to move labels which have little spaces on map, outside the map and instead use arrows to point to the province?

Re: using arrows to label provinces on map (gmap)

ballardw — Mon, 30 Apr 2018 18:14:42 GMT

This sounds like an annotate data set is required.

Your requirement will be to determine the x,y coordinates of where everything needs to appear on the map.

Then build a data set.

The SAS supplied macro %annomac should be available if you have GMAP installed. Add this code:

%annomac;

to make all of the other annotate macros available. The log will show how to get descriptions of what the various macros will help you do such as

%helpano( help);

My first step would be to use the %Maplabel macro to create a data set with the text of the labels and an approximately centered location.

If the text only needs to me moved a bit you can adjust the x and or y coordinates manually in a data step with code like

Data want_anno;

set maplabelset;

select (mapidvariable);

when(someidvalue) do; x=0.5; y=0.06; end;

when(otheridvalue) x=0.04; /* example of only one coordinate needing adjustment*/

otherwise;

end;

If you actually cannot get a location that will display the text then you need to specify:

1) a location for the actual text label

2) the text to display at that location (these two can be done with a %label macro call.)

3) specify a start location (near the text label) coordinates,

4) end location for an arrow (the %maplabel location likely

5) specify the arrow appearance options (the %arrow macro should work for 3,4,5)

The individual annotate macros such as %arrow should appear in the online documentation as well.

Insert the appropriate macro calls for the id variable in the SELECT block for the ids that need the moved label and the arrow.

Then tell gmap to use the annotate data set. Please be aware the you can use two annotate data sets, one on the Proc Statement and one on a plot statement like CHORO.

If you are likely to have many of these maps it will likely be a good idea to create a permanent data set with the appropriate coordinates to reuse.

Re: using arrows to label provinces on map (gmap)

Anita_n — Wed, 02 May 2018 06:23:00 GMT

Hi ballardw, thanks for your reply and explanation. I will try that and leave a feedback. Thanks

Re: using arrows to label provinces on map (gmap)

Anita_n — Wed, 02 May 2018 11:23:20 GMT

Hi bellardw,

I wasn't successful with the code. Maybe you could use this datasets on this link to explain it better. Here is the link https://communities.sas.com/t5/SAS-GRAPH-and-ODS-Graphics/using-colors-on-maps-gmap/m-p/457338#M15728

thanks

Re: using arrows to label provinces on map (gmap)

GraphGuy — Wed, 02 May 2018 12:28:05 GMT

One of my recent blog posts had a map with custom label placement, and arrows pointing from the label to the geographic area. I used lat/long coordinates for both the geographic label, and the area on the map:

https://blogs.sas.com/content/sastraining/2018/04/23/can-you-guess-which-10-rivers-produce-95-of-oceans-plastic-pollution/

Here's a link to the code I used:

http://robslink.com/SAS/democd97/rivers_and_plastic_info.htm

Re: using arrows to label provinces on map (gmap)

Anita_n — Wed, 02 May 2018 19:59:39 GMT

Hi Robert, thanks I will try that to see if I will be successful

Re: using arrows to label provinces on map (gmap)

Anita_n — Tue, 08 May 2018 09:49:28 GMT

Hey Robert,

I have being struggling with your code samples but am not getting through.

This is my code, maybe am doing something wrong but I can't fish it out. Please I need your help again. The labels are for the map on the link https://communities.sas.com/t5/SAS-GRAPH-and-ODS-Graphics/using-colors-on-maps-gmap/m-p/457338#M15728

Here is the code I have written so far

data anno_drawarrow;
length function $8 color $8;
set annolabel;
flag= 0;
xsys='2'; ysys='2'; hsys='3'; when='a';
function='label'; color='black'; size=2.5;
if id not in (ab, md, un, cd)  then 
	do;
		text=incidence; position='5'; 
		output;
	end;
else if id in (ab, md, un, cd)then 
	do;
	text=incidence; position='6'; output;
    function='move'; text=''; position=''; 
	flag=1;output;
end;

if  flag=1 then 
	do;	
        position=''; text=''; 
		function='draw'; size=.25; 
		flag=0;output;
	end;
run;

here ist the maplabel data.

I want some labels to go outside the map and use arrows to label them

Re: using arrows to label provinces on map (gmap)

Anita_n — Wed, 09 May 2018 11:05:32 GMT

I'm still counting on any help

Re: using arrows to label provinces on map (gmap)

GraphGuy — Fri, 25 May 2018 15:49:17 GMT

Do you have the lat/long coordinates for where you want the labels to be placed, and where you want the arrows to point to?

Re: using arrows to label provinces on map (gmap)

Anita_n — Mon, 04 Jun 2018 08:36:21 GMT

Hello Robert,

thanks for your reply. Its about the same datasets you helped me to solve on this link:

https://communities.sas.com/t5/SAS-GRAPH-and-ODS-Graphics/using-colors-on-maps-gmap/m-p/457338#M15728

Yes I have the latitudes and longitudes in the test.sas7bdat

I tried to follow your example but I could unfortunately solve the problem. I will be glad if you can help me here.

I have attached the datasets again but they are the same as that on this link:

https://communities.sas.com/t5/SAS-GRAPH-and-ODS-Graphics/using-colors-on-maps-gmap/m-p/457338#M15728

Re: using arrows to label provinces on map (gmap)

GraphGuy — Wed, 06 Jun 2018 13:01:28 GMT

My latest example also shows a couple of variations on the technique of labeling areas on a map:

http://robslink.com/SAS/democd98/guatemala_volcanoes_info.htm

http://robslink.com/SAS/democd98/guatemala_volcanoes.htm