To combine data from different files

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10
votes
2answers
11k views

How can I join several raster files using QGIS?

I'm new to QGIS. How can I combine multiple raster layers into one layer? The raster images are of different areas with very little overlap. The goal is to bring numerous town plats into one project. ...
9
votes
1answer
2k views

Merge Multiple Tables into a New Table in PostGIS

I am looking to merge a number of individual tables into a new table in PostGIS. This is an easy task when working with Shapefile data, but I am unsure how to do this in PostGIS. Any help would be ...
4
votes
1answer
935 views

How to merge many shapefiles in different folders?

Directory structure is basically as such: county\City\prep\POI\Completed\C1, ...C2, ...etc\ I'm trying to write a script to go through the *\Completed*\POIS.shp and merge them all together, at a ...
2
votes
1answer
642 views

merge raster images: error message procedure not found

I am using QGIS 1.8.0. Whenever I try to merge raster images I get the following error message: Traceback (most recent call last): File "C:\PROGRA~1\Quantum GIS Lisboa\bin\gdal_merge.py", line 36, ...
9
votes
2answers
3k views

Is there a difference in performance between Merge and Append in ArcGIS?

Often I find myself in a situation where I don't care whether or not my tool produces a new feature class, but I do care how long it takes to combine all of my large datasets. Does it take longer to ...
2
votes
1answer
320 views

How to merge hundreds of vector layers and sum attributes in QGIS?

I'm still at a fairly beginner level with QGIS and I've been banging my head against the wall trying to figure this out, so I would like to turn here for the internetz help. I am trying to construct ...
1
vote
2answers
5k views

How to Merge/Dissolve Polygons By Common Attribute Field in QGIS?

I have joined corresponding Local Enterprise Partnerships table data into a polygon shape file containing UK Local Authorities. How do I Dissolve or Merge the the Local Authorities polygons by ...
1
vote
3answers
4k views

Merging Two or More Layers using ArcGIS for Desktop?

I am working with three clipped layers that are shown in the TOC. I created these layers from a large watershed shape-file. However, each clipped layer includes the layer before it and only expands on ...
8
votes
2answers
787 views

How to add vertices to existing linestrings?

If I have Linestring(1 2, 1 5, 1 9) and a Point(1 3) Is there any function that can merge linestring and point preserving the order so output would be: Linestring(1 2, 1 3, 1 5, 1 9)
7
votes
4answers
3k views

Open source software to merge large shape files

Some background: I have 2 polygon shape files with approximately 500,000 records each. The two files are identical in terms of field structure. Using ArcGIS 10.0 I can'nt merge these two files using ...
5
votes
2answers
403 views

Extract certain area of contours/satellite images

I have 2 satellite images (jpeg2000 format) and 2 xyz-files from the same area. I am trying to extract certain region from the area including contour lines and the satellite image in order to import ...
3
votes
2answers
101 views

Correctly merging DEM rasters and eliminating edge effects

I'm using 10m DEM rasters from the NRCS Data Gateway for a large portion of California. The problem is some strange tiling that appears after merging, but isn't present in the original data (before ...
3
votes
2answers
730 views

Merging polygons that intersect by more than a specified amount

I am working with a dataset that contains a subset of property boundaries in a local government area, thus my dataset is made up of several thousand properties but not all are touching. Since it is a ...
2
votes
1answer
125 views

Merge feature classes in feature datasets

I'm trying to merge a group of like feature classes which are contained within separate feature datasets. I can merge feature classes within a file geodatabase without having issues by creating a list ...
2
votes
1answer
140 views

QGIS 2.2 Raster Merge losing color data

I'm trying to merge a couple of GeoTiff maps using Raster > Miscellaneous > Merge but the merge is only coming out in grayscale. The geotifs are using palettes color. How do I get the merge to keep ...
1
vote
0answers
243 views

Merge overlapping DEMs with irregular boundaries

I have a 10m DEM covering part of a state, a 20m DEM covering the whole state, and a 90m DEM covering the whole country. How can I merge them together, getting the best quality available in each area? ...
1
vote
3answers
533 views

Merge Zip Codes to Create new sales Markets

Let me preface this question by saying I am very novice with respect to GIS. With this in mind, I am looking to merge zip codes into sales territories. Instead of plotting data by zip code, I want to ...
5
votes
1answer
723 views

Using ArcPy to batch merge based on shapefile name?

ArcGIS 10 SP4 Python 2.6.5 I have quite a few shapefiles that are in many different directories. I'd like to pull out groups of like shapefiles, merge them, and move the results into a FGDB. I've ...
3
votes
1answer
140 views

How do I merge DEM rasters correctly?

I've been struggling with this problem for awhile. Here is a curvature raster to illustrate the problem. I'm using 10m DEM rasters from the NRCS Data Gateway for a large portion of California. The ...
3
votes
2answers
1k views

merge shapefile using ogr2ogr and retrieve the attribute of both

Ciao, I have two shape files that I want merge (overlay/intersect) having in the destination the attributes of the two sources file. ogr2ogr file_merged.shp tl_2010_us_uac10_conus_albersUA.shp ...
3
votes
3answers
681 views

How to merge a large amount of polygon-features in a script?

We have a very large shapefile with over 30000 features and want to merge it with a script on a server. Currently we try it with QGIS, but the processing takes way too much time. Is there a way to do ...
3
votes
2answers
725 views

How to join lines in QGIS for later using “lines to poly”?

After successfully merging lines (using snapping) with merge_selected_features i got nice result - one merged line. Next thing was to make polygon from created merged line. Result is not nice - it ...
2
votes
1answer
117 views

Merge from arcpy.ListTables() producing duplicate rows?

I was trying to manually merge file geodatabase tables and was getting Null values for the output file rows and decided to write a python script to merge the files. Here's my script: import arcpy ...
2
votes
4answers
333 views

Merge large number of polygons using QGIS

I have a series of polygons that are the output of another GIS program - I need to merge the polygons into a single polygon. I have tried a couple of different methods with no luck. I have tried to ...
2
votes
1answer
94 views

Merging and snapping Tiger line files

I have several adjacent (county level) TIGER road files. I want to merge them and create one contiguous file of snapped roads for the purpose of doing network analysis. Merging them is easy but ...
2
votes
2answers
649 views

Merge lines with the same 'name' attribute on QGIS?

I have a shapefile with a few thousand lines, each is a street segment. I'd like to merge all features with the same 'streetName' attribute into a single attribute. I only really care about the name ...
1
vote
1answer
82 views

CAD to GDB import using ValueTable function

I have several CAD files (DWG) that I want converted to Feature Classes within a file GDB. Each feature class will be based on a polyline attribute "LAYER" value, so I have a query filter applied ...
1
vote
3answers
2k views

What is the problem with the merge shapefiles tool in QGIS?

I'm having trouble merging shapefiles in QGIS. I'm using plugin ftools 0.6.1 and I get this: Any workarounds someone may know of? Thanks
0
votes
1answer
342 views

How to batch merge rasters using FOSSGIS tools?

I'm working with QGIS 1.8 (gdal 1.9.2) and GRASS 6.4.3...but on Windows 7. I "just" want to merge my raster. I've got a folder with 50 GTiff raster from Lidar data. The aim is to merge raster ...