Read All About Arctic on
ASI Blog
– Watch all Graphs on
ASI Graphs
Welcome,
Guest
. Please
login
or
register
.
1 Hour
1 Day
1 Week
1 Month
Forever
Login with username, password and session length
News:
Happy New Year 2024 (and sorry for the forum being offline some hours) /DM
Home
Help
Search
Login
Register
Support the Arctic Sea Ice Forum and Blog
Arctic Sea Ice : Forum
»
AGW in general
»
Developers Corner
(Moderator:
kassy
) »
Calculating area from satellite images
« previous
next »
Print
Pages: [
1
]
Go Down
Author
Topic: Calculating area from satellite images (Read 4756 times)
bairgon
Frazil ice
Posts: 133
Liked: 15
Likes Given: 0
Calculating area from satellite images
«
on:
December 21, 2016, 11:54:24 AM »
Given an image like
http://ocean.dmi.dk/arctic/images/MODIS/Lincoln/201612191227.NOAA.jpg
how can I calculate the area of the Lincoln Sea "polynya"?
There are Sentinel images like
http://ocean.dmi.dk/arctic/images/MODIS/Lincoln/20161220s01a.ASAR.jpg
with lat/long, but these don't cover the complete area to be calculated.
As an alternative, can the images be accessed using Google Earth or similar, with polygon drawing tools? I tried importing an image as an overlay but found it difficult to match it up.
Logged
Tealight
Frazil ice
Posts: 490
Liked: 176
Likes Given: 17
Re: Calculating area from satellite images
«
Reply #1 on:
December 25, 2016, 06:07:21 PM »
If you want to calculate area from images you need to know the exact resolution. The rest is pixel counting.
I do most of my area calculations and length meaurements with SNAP. It has a polygon drawing tool and can directly tell me length measurements of satellite images with geo information.
http://step.esa.int/main/download/
Logged
https://cryospherecomputing.com/
bairgon
Frazil ice
Posts: 133
Liked: 15
Likes Given: 0
Re: Calculating area from satellite images
«
Reply #2 on:
December 31, 2016, 02:10:28 PM »
Thanks for that hint. Downloading now.
Logged
Print
Pages: [
1
]
Go Up
« previous
next »
Arctic Sea Ice : Forum
»
AGW in general
»
Developers Corner
(Moderator:
kassy
) »
Calculating area from satellite images