Calculate area of inside polygon using inpolygon

Hello,

I have latitude and longitude data to plot coastal line of north america and then continent margin. As you can imagine this is going to be two irregular polygons where the coastline polygon will be placed within the continent margin polygon.

I want to plot these two polygons and calculate the area of land region (the area within inside polygon) using inpolygon function. I would truly appreciate if someone could help me with this.

thank you

Answer 1

[Star Strider]

There are Mapping Toolbox functions areaint and similar functions to do this. Those might be more appropriate. Follow the links in that and related documentation for other such functions.

[Anitha Limann]

Thank you for your response.

areaint gives me a list of values (1865 x 1 double). And I am not sure what they are. Is there any other method I could try?

[Star Strider]

I have limited experience with the function, since I only use it here. According to the Output Arguments section of the documentation, ‘When lat and lon define multiple polygons, a is a vector. Each element of the vector is the area of the corresponding polygon.’ so I assume that to get one scalar result, just add them using sum. (It also gives the option of summing different values depending on the ploygons selected.)

[Anitha Limann]

Thank you I will try again.

[Star Strider]

My pleasure!

Answer 2

[Matt J]

The polyarea command is for calculating polygon areas.

You can also use polyshape.area.

[Anitha Limann]

Thank you for your reply.

There are some places where boundaries overlap. from what I understood this function colors those areas and calculate the total area of all those overlaps.