MATLAB Answers

range different longitude and latitude geoshow

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muhammad iqbal habibie
muhammad iqbal habibie on 6 Apr 2020
Commented: darova on 8 Apr 2020
I have longitude 112 to 114 and latitude -6.8 to -7.4.I am trying to range the longitude and latitude from geoshow, but somehow it doesnt change much
close all ;
data1 = shaperead ( 'data.shp' ); % polygon data
geoshow (data1)
u = shaperead ( 'points.shp' , 'UseGeoCoords' , true) % point data of 3050x1
h = geoshow (u, 'Marker' , 'o' , ...
'MarkerEdgeColor' , 'g' , ...
'MarkerSize' , 6)
legend ([h], 0.5, 'ok' );
so data1 is the shapefile of polygon and u are the point location.I wanted to make the longitude and latitude is range by 0.5 or 1 in geoshow? Inside file u it contains Geometry = 'point', Lon (Longitude) and Lat (Latitude ).
I try to edit in legend but it shows:
Error using legend> process_inputs (line 554)
Invalid argument.Type 'help legend' for more information.
  1 Comment
darova on 6 Apr 2020
Please attacht the data. Can you make a simple drawing of what you are trying todo? The qustion is unclear

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Answers (3)

muhammad iqbal habibie
muhammad iqbal habibie on 7 Apr 2020
Edited: muhammad iqbal habibie on 7 Apr 2020
As you seen from my attachment the differences of each longitude on the x axes and latitude on the y axes is not same. I would like to make it range 0.5 examples for longitude starts 112 then 112.5,then 113. and also latitude start from -6.8 then -6.85 then -6.9. I try above to edit from the legend but it has an error. Beside the range 0.5 maybe can modified the range to other 0.01. Hopefully it is possible. Because when I read the shapefile from data1 it direct show,maybe can possible to change the range of longitude and latitude.

darova on 7 Apr 2020
Here is my idea
Use meshgrid to create a grid (red points)
Use inpolygon to choose points inside map (blue circles)
darova on 8 Apr 2020
try this
latstart = 112;
lonstart = -7.5;
step = 0.5;
newlat = round((lat-latstart)/step)*step + latstart;
newlon = round((lon-lontart)/step)*step + lonstart;
Some duplicate values may appear. You can remove them
[~,ix1] = unique(newlat);
[~,ix2] = unique(newlon);
ix = unique([ix1(:);ix2(:)]);
newlat = newlat(ix);
newlon = newlon(ix);

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Sean de Wolski
Sean de Wolski on 7 Apr 2020
Look at bufferm Call that on your data and then just take the bounds() of it.
  1 Comment
muhammad iqbal habibie
muhammad iqbal habibie on 8 Apr 2020
Any examples to use if my longitude and latitude it belongs from the shapefile of data1 using bufferm? thank you

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