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Newbie's GIS / How to convert bounding coordinates
« Last post by yuyu on April 21, 2011, 03:54:23 PM »
 ::) i' am still new in i have problem to convert this  shapefile coordinates..pls help me

From this

road            (in decimal degrees)
                   west  : 109.686580
                   east   : 109.686581
                   north  :  -0.000132
                   south  : -0.000133

                   (in projected or local coordinates)
                   left  :117.949830
                   right : 118.008510
                   top   : 4.450283
                   bottom : 4.349939

to this coordinates

river             (in decimal degrees)
                  west :117.949268
                  east : 118.068604
                  north : 4.450312
                  south : 4.349549

                  (in projected or local coordinates)
                  left  : 917653.613664
                  right : 924155.206293
                  top  : 494378.696356
                  bottom : 483284.504159
GIS/RS related Events / Lidar Data Interpretation with FME - Webinar 28th April 2011
« Last post by MyGIS on April 13, 2011, 03:58:49 AM »
Hi there,

Using Lidar data and looking for the right tool? Check out this webinar on the 28th April 2011, please register, it is very interesting.

Happy viewing !
Newbie's GIS / Re: how set up RSO in ER Mapper?
« Last post by ykuan87 on April 09, 2011, 10:36:55 AM »
my aims of study are produce orthophoto and rectified photo, so it stated that two different software are produced their own output respectively as following...
-Large format - rectified photo(ER Mapper) vs orthophoto(Erdas8.6)
-Small format - rectified photo(ER Mapper) vs orthophoto(Erdas8.6)

Actually my data collection for GCPs are secondary data. i have two different set of GCPs and its source which are:
i) Large format aerial photograph - rapid static (RSO)
ii) Small format aerial photograph (UAV images)- real time kinematic (RSO)
i was failed to borrow any related gps instruments so i oni can proceed the both format aerial photograph with their GCPs. Since there are came from different GPS instrument thus the comparison between large format and small format won't carried out.

i tried to checking both set of GCPs mentioned by picked up a same point from them for verify, unfortunately there r not matched and quite far. therefore, comparison between large format or small format will be execute.

so my purpose oni focus on find out the how many accuracy (RMSE) between orthophoto and rectified photo in the small and large format.

assumption only
for example, small format =+-2.323m, large format = +-0.543m.
this means rectified photo oso can achieved good accuracy and can be applied in mapping as well if use er mapper to proceed data.
as long as we know, erdas is more accurate commercial software for mapping. ( i oso using my reference data to compared, both output are approaching to each other. )

small format can be suggested to applied in the mapping project where does not quire high accuracy.

However, i oso wanna asking abt the price of ER Mapper6.4 and Erdas8.6 in the Malaysia?

Newbie's GIS / Re: how set up RSO in ER Mapper?
« Last post by Noordin on April 08, 2011, 11:23:29 PM »
Since you are using RSO, thus I presume it is a 2D rectification. What is your source of GCP? Are they in RSO too? Rather than working in two softwares can I propose for you to work successfully with all the rectifications techniques on one software. Once that works and being validated, it would be much easier to "try and test" on the other software since now you already have a baseline data to work and compare with.

Newbie's GIS / Re: how set up RSO in ER Mapper?
« Last post by ykuan87 on April 08, 2011, 06:20:08 AM »
i.   To produce orthophoto and rectified photo (i.e raster) using differential rectification and rectification techniques respectively.
ii.   To produce digital map (i.e vector map) based on the orthophoto and rectified photo.
iii.   To access the accuracy of the orthophoto, rectified photo and digital map.

i was using erdas8.6 to produce orthophoto and ER Mapper6.4 to produce rectified photo.

Newbie's GIS / Re: how set up RSO in ER Mapper?
« Last post by Noordin on April 08, 2011, 01:01:22 AM »
I think the problem started when your work seems to be in piece meal i.e. you try to solve immediate problem without looking at the final objective. Can we know what is your objective of the project?

Also, briefly provide us the methodology that you took. Projection, rectification, transformation etc are just processes of getting the data onto a certain reference frame. Frankly I don't understand when you say "RSO parameter to built the kertau datum" ! In map projection you have to define the Datum first before doing the projection and not vice versa.

We hope to help you whenever we can but having short of the objective of the project, we may also be misled by your queries  ;)


Newbie's GIS / Re: how set up RSO in ER Mapper?
« Last post by ykuan87 on April 06, 2011, 09:30:36 AM »
ADMIN, did u know much about the differential rectification (Erdas) and rectification (ER Mapper)? which software generally used for mapping nowadays? because i was using both of this photogrammtric software to process of data. However, i oso feel blurred in my problem statement of my thesis because i duno what signnificant material and information need to added in order to support the purpose for doing this thesis...

actually i have discussed them in term of price since both mentioned software are commercial software, but i feels it doesn't make any sense.
Newbie's GIS / Re: how set up RSO in ER Mapper?
« Last post by MyGIS on April 04, 2011, 10:25:32 PM »

Thanks for the heads-up ! Please keep on inform in us about your progress !

Thanks again.
Newbie's GIS / Re: how set up RSO in ER Mapper?
« Last post by ykuan87 on April 04, 2011, 06:59:19 AM »
Admin, i think i have solved the RSO projection (Datum Kertau) without doing the transformation projection from cassini to RSO. If i use the RSO parameter to builds the kertau datum, the result was better rather than transformation. 
GIS/RS related Events / FME Third Workshop - for Malaysia - Singapore and Hong Kong
« Last post by MyGIS on April 01, 2011, 04:22:45 PM »
Dear All,

We are please to inform you that we will be conducting our third FME Workshop. This workshop will be conducted at GIS Innovation Sdn Bhd Office located at:

Lot 2.48, 2nd Floor, Kompleks Antarabangsa
Jalan Sultan Ismail, 50250 Kuala Lumpur,
Tel : +603-2145 5575 Fax: +603-2145 5570

Date: 21st April 2011
Time 2:30 p.m.


1. What is FME?
2. FME or ESRI Interoperability Extension which one should I use?
3. Building topology and cleaning data with FME Workbench
4. Styling KML with FME
5. Styling CAd with FME 2011 (a breeze).

Kindly register before 23rd April 2011 as seats are limited.

Thank you.

Please call us if you cannot make it for this event but would like to come for the next available.
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