[GRASS-dev] visualize GRASS vector/raster on web

GRASS GIS GRASS GIS developer
1

how to visualize vector/raster from directly from GRASS database?

I am building webGRASS. for that I linked GRASS GIS all libraries to my application without any wrappers…
Now I can execute any grass command online. But for rendering I use OpenLayers. I want to change OpenLayers and use a WPaintWidget to draw raster and vector data

I can make this happen in this way
[1] call d.vect which will call v.out.ogr and create a gml file → display gml on OpenLayers.Map

Now I want to reduce the overhead by spawning different process like d.vect → v.out.ogr → gml -->openlayers
I need rendering this way

[2] Read GRASS data directly from database (points/line/polygon for vector and image pixel values from GRASS raster format
so the chain will be
GRASS Raster data → (image pixel values) MyNewMapCanvas
GRASS Vector data —>(points/lines/polygons) MyNewMapCanvas

The reason behind my need is that on web it will increase speed and efficiency when we read data from GRASS database directly

All I want to do GRASS GIS core language C/C++ to make a web application

it is possible because I am linking my website with required grass libraries (libgrass_*)

Any help will be greatly appreciated…

–

Regards,
Mohammed Rashad K M
M.S. (By Research) student
Lab for Spatial Informatics
Department of CSE
International Institute of Information Technology
Hyderabad, India

2

2011/11/29 Mohammed Rashad <mohammedrashadkm@gmail.com>:

how to visualize vector/raster from directly from GRASS database?
I am building webGRASS. for that I linked GRASS GIS all libraries to my
application without any wrappers..

I don't understand why you are spending so much time in this topic...
I suggest you to work simply with OL e WPS [0]

--
Regards,
Mohammed Rashad K M
M.S. (By Research) student
Lab for Spatial Informatics
Department of CSE
International Institute of Information Technology
Hyderabad, India

my2cents

[0] http://grass.osgeo.org/wiki/WPS

--
cheers
Luca

http://gis.cri.fmach.it/delucchi/
www.lucadelu.org

3

On Tue, Nov 29, 2011 at 9:52 PM, Luca Delucchi <lucadeluge@gmail.com> wrote:

2011/11/29 Mohammed Rashad <mohammedrashadkm@gmail.com>:

how to visualize vector/raster from directly from GRASS database?
I am building webGRASS. for that I linked GRASS GIS all libraries to my
application without any wrappers…

I don’t understand why you are spending so much time in this topic…
I suggest you to work simply with OL e WPS [0]

because ultimate goal of webGRASS whcih will be as powerful as GRASS GIS but on web
using pyWPS we can do grass commands in a different way and it is WPS.

I want worlds first webGIS which can do all kind of analysis on web

future webGRASS should act like a web UI like wxGUI.

with webGRASS you only need to carry grass data directory not the whole webGRASS
In a company if you want to install grass you need to setup a postgis or WMS layer and share it but you can do GRASS analysis on indivudual system and some one need to upload it on server for others to use.

See this scenario.
For India or some other country can install webGRASS on a central server and all government agencies can do all work online using webGRASS. like land inspection checking which types of agricultural production was going on in a particular area from their office without going there.

Also a village office can measure the land needed by people for building their home or company.

Whats wrong if we can do everything under one umbrella webGRASS???

A university can teach GRASS GIS, OpenSource GIS using webGRASS by installing webGRASS on university website

These all are my goals when I started webGRASS. My ideas can be wrong. If not it will be a great achivement and people will love to work on GRASS for teaching, doing analysis within a company etc… etc…

current way to use GRASS on web is to
use GRASS(analysis) + pyWPS(processing) + OL(rendering)

But remember we cant do all type of analysis using pyWPS (correct me if I am wrong)… :slight_smile:

I am thinking a to build a seamless gui which can read grass database process data show it on web and download it.

In future webGRASS will also be a part of OSGeo :slight_smile: (just my wish)

Please let me know your comments and suggestions if any

Hope I explained well…

–
Regards,
Mohammed Rashad K M
M.S. (By Research) student
Lab for Spatial Informatics
Department of CSE
International Institute of Information Technology
Hyderabad, India

my2cents

[0] http://grass.osgeo.org/wiki/WPS

–
cheers
Luca

http://gis.cri.fmach.it/delucchi/
www.lucadelu.org

–

Regards,
Mohammed Rashad K M
M.S. (By Research) student
Lab for Spatial Informatics
Department of CSE
International Institute of Information Technology
Hyderabad, India

4

2011/11/29 Mohammed Rashad <mohammedrashadkm@gmail.com>:

Whats wrong if we can do everything under one umbrella webGRASS???

nothing, but I'd prefer to use standard, for simplify the work mine and users.
I remember in Prague there was a Polish guy (sorry but I don't
remember the name) that show me a proof of wps service in geoserver to
work with all the GRASS module and after show the data in OL.

current way to use GRASS on web is to
use GRASS(analysis) + pyWPS(processing) + OL(rendering)

But remember we cant do all type of analysis using pyWPS (correct me if I am
wrong)... :slight_smile:

not only:
- php
- zoo
- ( geoserver, 52° North I never try them but using sextante you can
work with grass)

Obviously you are free to develop this application, but I'm not sure
that this is the best solution

--
cheers
Luca

http://gis.cri.fmach.it/delucchi/
www.lucadelu.org