04/02/2013

Contour Plugin review

In Windows QGIS, Contour plugin worked like a breeze...



Except for this funny output
Which did not make much difference to the southern portion contours
Contour plugin homepage set 3 prerequisite modules...
In Ubuntu QGIS, Numpy was installed...
So was Matplotlib ...
And was Shapely ...
Yet disappointing error message still crops up. Rats!
Ujilari Contour Plugin

Pertama, nampaknya versi Windows berbanding dengan versi Ubuntu lebih mudah untuk pasang. Versi Ubuntu pasti akan mendapat kritik novis yang cuma hendak siapkan kerja secepat mungkin. Nasib baik komputer dwi OS saya mengatasai masalah ini kerana sekiranya jalan kiri tersekat masih ada jalan alternatif. Saya mula dengan mengekspoitasi Google Map dan memilih kawasan Genting Highland di Pahang sebagai kawasan kajian. Diwujudkan lapisan elevation, ditindihkan Google Physical lalu disediakan beberapa titik elevation berasaskan garis selar dibawah. Seterusnya, dikonfigur Contour plugin lalu dioperasinya. Hasil ujilari adalah serentak tetapi saya kurang puashati kerana output tidak mencerminkan kawasan two bukit yang saya wujudkan. Terdapat satu kawasan melebihi 1600m yang tidak sempurna. Selepas mengeluarkan salah dari satu bukit, output selar masih tidak sempurna. Sama ada plugin perlu dimantapkan lagi atau saya yang perlu lebih mahir lagi dengan plugin tersebut kurang pasti, bagaimana pun, saya kagum penyediaan selar amat mudah dan kebolehan menghasilkan bilangan selar mengikut keperluan pengguna dengan mudah perlu dipuji.

Contour Plugin review

Well, for one, the Windows as against the Ubuntu version installation was a surprise and went like a breeze. The Ubuntu version would put off the novice who just wants to get the job done. Fortunately for me, my dual boot computer solves this problem and if the left upper cut doesn't, the right uppercut will. My trial involved exploiting Google Map and my study area was the famous Genting Highland resort area in Pahang. I created a simple elevation layer, overlaid it over Google Physical and proceeded to create a few elevation points based on the contour line underneath. Then I configured the Contour plugin and ran it. The result was immediate but I was surprised and a bit disappointed the output  did not reflect the two hill tops I created. A certain portion above 1600m did a cheeky shortcut. I decided to delete the small hilltop and the contour adjusted itself for the second output but was still not complete. Room for improvement here or room for further trials for me to carry out, still, I was impressed it was so easy to create and customize the number of contour lines to my choice.

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