When using "geoplot" to create a map, how can I change the map projection to Lambert? It seems that "m_proj" cannot be used together with geoplot.

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世园 李
世园 李 2023-9-10
评论： Shiyuan 2023-12-23
minlat = 25;
minlon = 65;
maxlat = 45;
maxlon = 108;
m_proj('lambert','lon',[64 108],'lat',[21 48]);
geoplot([minlat maxlat],[minlon maxlon],'-*');
geodensityplot(allLat, allLon, weights*10^8, 'FaceColor', 'interp');
geobasemap none
geolimits([25 45],[65 105]);
%This results in two separate plots. I would like the geoplot to be displayed in Lambert projection.

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回答（1 个）

VINAYAK LUHA
VINAYAK LUHA 2023-9-20
Hi 世园 李 ,
It is my understanding that you wish to change the projection type as “Lambert” for the “geoplot” function.
The “geoplot” function plots data only in geographic coordinates, hence current axes need to be either geographic or map axes, since current axes set by “m_proj” are neither geographic nor map axes, it throws an error.
Here’s a workaround to set the projection method as “lambert”
  • Create a projected CRS object by specifying an EPSG code,5325 for “Lambert Conic Conformal”.
p=projcrs(5325);
  • Create a newmap with p as the coordinate reference system (CRS).
newmap(p);
  • Geopmap plots on this map axes follows “Lambert Conic Conformal method”.
Explore the following documentations for more details-
projcrs - https://www.mathworks.com/help/map/ref/projcrs.html
newmap -https://www.mathworks.com/help/map/ref/newmap.html#d126e123131
Regards,
Vinayak Luha

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