[Qgis-user] Raster

[Richard McDonnell]

Easiest way I can think of doing what you want is to create a VRT of the three raster’s.

Raster ==> Miscellaneous ==> Build Virtual Raster

When you do this set the Nodata value to 0 (the default transparent value form the Georeference Tool)
This should create a merged raster for you and allow you to use the correct transparency value.

Hope this helps,

Richard



——
Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management

——
Oifig na nOibreacha Poiblí
Office of Public Works

Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
M +353 87 688 5964 T +353 46 942 2409
https://gov.ie/opw

——
To send me files larger than 30MB, please use the link below https://filetransfer.opw.ie/filedrop/richard.mcdonnell@opw.ie

Email Disclaimer: https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/

——
MSc GIS, FME Certified Professional

——
Oifig na nOibreacha Poiblí
Office of Public Works

Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
M +353 87 688 5964 T +353 46 942 2409
https://www.opw.ie

——
Email Disclaimer: https://www.opw.ie/en/disclaimer/
From: Qgis-user <qgis-user-bounces at lists.osgeo.org> On Behalf Of Lazanu Ciprian-Catalin via Qgis-user
Sent: 24 May 2022 11:53
To: Uwe Fischer via Qgis-user <qgis-user at lists.osgeo.org>; Uwe Fischer via Qgis-user <qgis-user at lists.osgeo.org>
Subject: [Qgis-user] Raster

Hello,
I georeferenced three maps ... all good, quite easy by using points from map canvas. When my map was ready it has a black border (image 1). This is solved by ~Custom transparency options~, and a black border disappears. But this solution is just temporarily, because if I close and reopen ... that raster has again a black border. I want to merge the three maps in one, but it does with a black border between maps.
A solution to this annoying problem?

Thank you
https://drive.google.com/drive/folders/1qM1_TeFUng9-xyRXRQCuMrEMwxFeJV7n?usp=sharing images
Meet Google Drive – One place for all your files<https://drive.google.com/drive/folders/1qM1_TeFUng9-xyRXRQCuMrEMwxFeJV7n?usp=sharing>
Google Drive is a free way to keep your files backed up and easy to reach from any phone, tablet, or computer. Start with 15GB of Google storage – free.
drive.google.com


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20220524/44e6a59b/attachment.htm>