[mapserver-dev] Precision about geotransform

[Lime, Steve D (DNR)]

Is the data you're using raster only? Wonder if vector drawing exhibits the same issue.

Steve

From: Mohamed Saâd HESSANE [mailto:saad.hessane at gmail.com]
Sent: Tuesday, April 26, 2011 4:07 AM
To: Frank Warmerdam; Lime, Steve D (DNR)
Cc: thomas bonfort; mapserver-dev at lists.osgeo.org
Subject: Re: [mapserver-dev] Precision about geotransform

Hy List,
There's no other explication?
Thank's

2011/4/22 Mohamed Saâd HESSANE <saad.hessane at gmail.com<mailto:saad.hessane at gmail.com>>
Hy list,
@Lime : I use python mapscript :

#!/usr/bin/python
# -*- coding: iso-8859-1 -*-

import mapscript
import time, csv

if __name__ == '__main__' :
    mapFile = 'mapfile/mapFile.map'
    maps = mapscript.mapObj(mapFile)

    csvFile = csv.writer(open('rotation.csv', 'a'), delimiter='\t')

    for i in range(360) :
        maps.setRotation(i)
        avg = 0
        for j in range(5) : # 5 test and get the average
            start = time.clock()
            maps.draw()
            end = time.clock()

            avg += end-start

        avg /= 5
        print i, avg
        csvFile.writerow([str(i), '%.2f' % avg])

The script write a csv file that you can import in OOo Calc or MS Excel. And then make a radar graphic.
I use a 5 GB datasource of SRP rasters, tileindexed, and having overview. The size is 600x600, and the zoom level is 1.

@Frank : I m doing a lot of tests about rotation, zooming, resizing... to benchemark mapserver, and set a limit to my futur application. That is why it's important to me to know why it's take less/more time in specific angles.


2011/4/21 Frank Warmerdam <warmerdam at pobox.com<mailto:warmerdam at pobox.com>>
On 11-04-21 10:32 AM, Mohamed Saâd HESSANE wrote:
Hy list,
I have a question. I'm doing a benchmarking test of a rotated map, and i get
the result in the attached file.
My question is why it take more time to draw a map rotated at 45° than a map
rotated at 90° or 183° ???
Thank you !

Mohamed,

It is not obvious to me why you are seeing the odd performance-base-on-angle
results you are encountering.  I implemented the rotation support, and the
raster resampler used for warping rasters.

Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com<mailto:warmerdam at pobox.com>
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent


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