[Qgis-user] QGIS- How to render a raster using a field other than Value [SEC=UNCLASSIFIED]

Thu Oct 29 20:09:49 PDT 2015

Hi, 
If you save your raster as a "point file", you can then merge your point data with the "raster point file".  Then, you can use any field as a " z" field and make a new raster with every field if they are numbers.  
You could make a multi band raster with your data.  Unfortunately, you will need to remember the correspondence between the numbers and the field values.  Unfortunately, there is no raster data base in QGIS. 
Nicolas Cadieux M.Sc. 
Les Entreprises Archéotec inc.  
8548, rue Saint-Denis Montréal H2P 2H2 
Téléphone: 514.381.5112  Fax: 514.381.4995 
www.archeotec.ca 
On Oct 29, 2015 19:55, "Inna Nogeste [via OSGeo.org]" <ml-node+s1560n5233444h25 at n6.nabble.com> wrote: 

Thanks Damien, 
For the purposes of the product that I'm working on the preference is for the data to be maintained as a raster. 
I've been using QGIS to test cartographic design and Map Server export (plugin) functionalities. It's worked fine for the data I've been given and what I've wanted to achieve except for the land use raster. I've
 needed to use ArcMap for the landuse raster data. 
The MapServer plugin isn't working in QGIS 2.10 Pisa but was working in QGIS 2.8. 

Regards, 
Inna 

(I've removed your screen grab from an earlier email as I keep on getting messages saying that this message is too big for this listing so don’t know if any of the QGIS developers have seen this query). 

From: Damien
 Stephens [mailto: [hidden email] ] 
Sent: Wednesday, 28 October 2015 6:18 PM 
To: Inna Nogeste 
Cc: [hidden email] 
Subject: RE: QGIS- How to render a raster using a field other than Value [SEC=UNCLASSIFIED] 

At this point my only suggestion is to convert the raster to polygons. Hopefully the text is maintained. 

Could you send a clipped version of the raster to confirm? 
Thanks 
damien 

From: Inna Nogeste
[hidden email]  
Sent: Wednesday, 28 October 2015 2:29 PM 
To: Damien Stephens; [hidden email] 
Subject: RE: QGIS- How to render a raster using a field other than Value [SEC=UNCLASSIFIED] 

Thanks for the suggestion. I've looked at it. Band = Band 1 (Gray) and there is no option to select a field or even input Values. 
It would be good if QGIS could have the option of selecting a field to symbolise as this would be useful in raster data such as land use. 

Inna 

From: Damien
 Stephens [ [hidden email] ]

Sent: Tuesday, 27 October 2015 12:08 PM 
To: Inna Nogeste; [hidden email] 
Subject: RE: QGIS- How to render a raster using a field other than Value [SEC=UNCLASSIFIED] 

Ah ok the text field may cause a problem. 
I don’t have any rasters with text values to test. What happens when you  try the paletted render type with text in the band rendering tab on the layer properties dialogue? 
Cheers 
Damien 

From: Inna Nogeste
[hidden email]  
Sent: Tuesday, 27 October 2015 7:34 AM 
To: Damien Stephens; [hidden email] 
Subject: RE: QGIS- How to render a raster using a field other than Value [SEC=UNCLASSIFIED] 

Hi Damien, 

Thanks for your reply. 
I am working with land use raster data which only has 1 band.

The values in the Value field have been attributed to a landuse (as a text attribute) in a newly created field which is what I want symbolise. In ESRI ArcMap, I can select whatever Value Field I want from a drop
 down list of fields in the raster data. It would be good to have a similar function in QGIS.

Inna 

From: Damien
 Stephens [hidden email] 

Sent: Wednesday, 14 October 2015 6:37 PM 
To: Inna Nogeste; [hidden email] 
Subject: RE: QGIS- How to render a raster using a field other than Value [SEC=UNCLASSIFIED] 

If your raster has more than one value field (band)  it should be pretty simple. The band rendering tab on the layer properties dialog lets you chose the band to colour. 

In the attached screen grab I have chosen band 1 using a singleband pseudocolour render. 

Hope that helps. 

From: Qgis-user
[hidden email] 
On Behalf Of Inna Nogeste 
Sent: Wednesday, 14 October 2015 2:13 PM 
To: [hidden email] 
Subject: [Qgis-user] QGIS- How to render a raster using a field other than Value [SEC=UNCLASSIFIED] 

I would like to render my raster using a field that is not the Value field. Is it possible to do this in QGIS? This is easily done in ESRI ArcMap. 
I have access to both QGIS 2.10 and QGIS 2.8. 

Regards, 

Inna Nogeste | Spatial
 Information Specialist 

Environmental Information Management 

Data Management 
Geospatial Data and Access Unit 

Bureau of Meteorology 
www.bom.gov.au 

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