Map of Thailand : Terrain Analysis using QGIS


This project is to create a map of Thailand using QGIS and Adobe Photoshop, to see how much QGIS’ features are different from ArcGIS’.

Data

Digital elevation model (DEM, 15″) and administrative borders of Southeast Asia were downloaded from Viewfinder Panorama and Humanitarian Data Exchange respectively.

Terrain Processing

The DEM layer was processed in QGIS using terrain analysis. It has to be noted that Z factor must be reduced to 0.0007 (from 1.0000) as Southeast Asia’s topography is very flat compared to the other parts of the world, Z factor > 0.0007 will make the map looks exaggerate.

Extra layers for more information (and aesthetic)

After the hillshade layer was made, the other layers: land use, road networks, urban settings, and major rivers were overlayed together and exported as PNG format.

Post-processing

Adobe Photoshop is used to adjust the color scheme and labeling. Blue – green color scheme was used to portrayed natural features: rivers (blue), forest (dark green), farmland (yellow-green). In contrast, red tones were used to portrayed artificial features: orange (urban settings), red (cities’ names), and gray (roads).

thai_hill_export

QGIS vs ArcGIS

Compared to ArcGIS, QGIS is quite easy to understand. There might be some functions in ArcGIS that are unavailable in QGIS but there are a lot of plugins from the internet. In this project, all functions used to process the map are in QGIS already.

5 thoughts on “Map of Thailand : Terrain Analysis using QGIS

  1. Right here is the perfect website for anyone who would like to understand this topic. You understand so much its almost tough to argue with you (not that I really will need to…HaHa). You definitely put a brand new spin on a topic which has been written about for decades. Great stuff, just wonderful!

  2. Nice blog right here! Additionally your web site so much up very fast! What web host are you the usage of? Can I am getting your affiliate hyperlink for your host? I desire my web site loaded up as fast as yours lol

  3. I’m no longer sure the place you are getting your info, but good topic. I needs to spend a while studying more or figuring out more. Thanks for wonderful info I was on the lookout for this info for my mission.

    1. Thank you! I got the data from Viewfinder Panorama (UK), Humanitarian Data Exchange, and USGS. These are acceptable sources when I studied in the US. I didn’t use Thailand’s official data because some of them are not publicly opened for download.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.