I have a large number of LiDAR files (in .asc format) that I'm wanting to catalogue so it is easier for people to find the files they want.  How can I take LiDAR files I have, and create a .shp file (ideally polygons) of the areas covered.    My end goal is to have a .shp file people can open on top of a map, check whether or not their location has been covered by LiDAR and then identify the file name that they're after.
122918
I am working in QGIS 2.10.1 and I have the following situation: I have some Landsat8 scenes (different paths and rows) and I want to extract their boundary. My final objective is to superimpose them to the vector of my study area, so that I can show how the scenes cover the study area and in which points they overlap.  I have already tried to convert the raster into a vector, but QGIS cannot make it, it crashes or it gives me back only part of the polygon.   Is there anybody who's got an idea to solve this problem?
71561
I need to create a web map showing many raster layers. I am using mapserver and want to use Openlayers, however I can't find any good tutorial about it. I see a couple of old questions ( and ) saying that there were no good documentation. Have the things changed recently?  I would like to find a tutorial teaching from basics to rather complicated things with good explanations of the code and pictures/examples of the results. For now I managed to do only the simplest web map with my .map file, but I need to customize it (add legends, group layers, add more controls, embedding, etc).
110044
I have downloaded raster map data from ONS, the data has come in the form of two files... one is full of  .tlw files and the other is full of .tab files...   How do I import it into a raster layer to ArcCatalog?
61748
I am trying to find the shapefiles for postcode sector and districts in the UK. Specifically inside London. I know I can go and pay for these but I only really need to use them once. I want to generate my own mapping tiles with the shapes on one version of the tiles. Allowing me to show all the postcode boundaries without overloading the JavaScript on the client side.   I could "redraw" some of shapes myself (tracing from others) but would be great if there were some shapefiles already out there.   Can anyone help?
14299
I was wondering if there is an option to convert LiDAR data (.las) to a  (DEM/DSM) format that ArcGIS 10.0 can read?
119192
So I'm working on a project that's been in development for over a year, but I only recently got involved. My task involves converting roughly 2,500 KML files into another format, importing these files into a Geoserver, and then copying over the associated style information for each file. I realize that Geoserver allows you to import KML files directly, however, our files never seem to render correctly, and my boss would like to move away from KML format for philosophical reasons.   Using ogr2ogr, I've tried to convert these files into ESRI Shapefiles, however the conversion process only worked on roughly a third of the files and erased some of the metadata called for in the style information. The files that didn't convert code for polygons and points, which I've read can be an error for other programs like QGIS.  I've also tried to put all of the KML files into a PostGIS database and convert them like that. However, that seems to delete all of the data leaving essentially blank tables for import.  TL;DR I need to find a way to convert 2,500 KML files into a format usable by Geoserver, and will work with XML style information. I'm a complete GIS noob and this is my first time posting, so I'm sorry if this seems a bit ridiculous.
75894
I am using Postgres 10.3 / Postgis 2.4.2, and I have thousands of ".asc" files (LiDAR DTM/DSM files) to import to the db. However, the format is something like:  ncols 1000 nrows 1000 xllcorner    297000 yllcorner    519000 cellsize     1 NODATA_value -9999 -3.616 -3.617 -3.618 etc   What is an easy way to import this data into PostgreSQL/PostGis?
22957
How can I create a 3D shapefile containing line features or point features? I have to extract the elevations from a DEM and then export a shapefile containing 3D features. I'm currently working with QGIS 2.8.4
101249
How can I delete duplicate LiDAR points? I incorrectly read the same las twice and saved as a one file resulting in duplicate XY points.  How should I delete these duplicate points?
43224
I have a folder and it contains two feature classes, e.g., a.shp and b.shp. The script tool created has two parameters. The first one is the model location, and the second one needs a feature class (a.shp), as shown in the below picture.  What I really want is every time when I set up the model location for the first input, the second input will automatically find the a.shp as the input rather than the user needs to choose a.shp from that folder. I noticed that the dependency is probably what I really need, but there is no code example. Any suggestions?   I am using ArcGIS 10.3.1 Advanced License.
32373
I want to try to make a simple 3D map for a small area (10 square miles) with some housing, some roads and some vegetation on it. My geodata is as follows:    shapes with houses/roads/vegetation.  LIDAR point cloud data over the area (can easily be built to a dem). georeferenced aerial image.   Any idea where to start to bundle these geodata together and make a neat looking 3D map?
80587
I'm looking for a shapefile for the coastline of the UK.   I'm guessing the Ordnance Survey 'geo-portal' is the best place to get this, but whenever I go to the Ordnance Survey site I get the shakes. (Seriously, trying to find any data on that site is really traumatic. I don't have a spare three days.)  Does anyone just have a simple URL for such a shapefile?
4976
I usually use qgis. I explain my problem with an example: there is a forest (irregular geometry1 ) and one tree (geomery2). I want to know the maximum number of trees that the forest can contain. Furthermore i want a shapefile output of the best disposition of these trees inside the forest.
117150
I have a maps where i want to show 6 different sites around europe. Instead of creating 6 different maps, i want to use the atlas generator.  I'm using QGIS 2.18.3 (Las Palmas).  I have made a coverage.shp including 6 polygons to show the extent of my different maps. Also, i set visibility presets (always showing 2 Layers: one is my backround google satellite image and one is always my vector shape). I have consulted a previous question:  ().  The Problem I have is that i want each map to have a different scale. I added an attribute to my coverage layer with the scale of my choice (eg. 30000, 16000...etc.). In the Print composer I went to the scale of the Map, data defined override > Edit, and set the scale of my attribute table. This is however not working.  where am I going wrong?
35400
I have several shp files which are the components (or tiles) of a map, I have joint all these tiles together to have a large shp file. Then I realized some of the polygon is now split into 2 halves, as the upper part belongs to a tile, while the lower part belongs to another tile.  This output disturbs me a lot as I need to fill some polygon, but not part of the "split polygon", so I need to find a way to merge these split polygon back to one (preferably mechanical way, as I have 10000+ polygons, not knowing which are split, which are not).  I need to know if the two or more polygons originate from the larger polygon. And I think I can somehow use union and spRbind to create an algorithm for this task. But I doubt if I am really the first one who encounters this problem, so I wonder if there is any existing tool in R that can solve this.  Thanks.
31622
Any ideas as to how can I convert dwg to shp?  I tried Kosmo and gvSIG. gvSIG kind of worked but it seems like I lost information.. in addition everything was converted into lines, no polygons. I can manually recreate the polygons, but there must be a better program to do this conversion.  Ideas?
28894
I'm looking for a qml file (or equivalent e.g. sld) to allow me to use QGIS to take OpenStreetMap data and produce paper maps. I'm re-asking this question (it was asked once or twice over a couple of years by other people) because I'm really surprised not to easily find such a thing already (I looked hard).   I have found  - which are good, but only style basic data like roads (and do so simply). I've successfully followed the  for getting OSM data to work with. I've carried out some basic style editing successfully. I realise I could create my own styles for this purpose - but this seems like a very big job. I want a visually pleasing map taking into account most of the data available on OSM (i.e. not just streets, but tracks, paths, rivers, woods, lakes, buildings and so on). I'd have thought that there would be other people out there already doing the same... It seems odd to have to re-invent the wheel when both OSM and QGIS are open source / open data projects. I feel like maybe I've just missed the obvious repository of OSM qml files which resides out there on the internet somewhere if you know where to look.  Additional notes in response to query below...  Ideally I'm looking for a Mapnik style rendering of the OSM data, but any equivalent properly developed and complete style would be good.  At the moment the objective is to use this data to produce paper mapping, but simple use of the mapping as base data on which other geographic data can be displayed also requires a decent rendering. At work I use Ordnance Survey data completely styled to produce a full and very detailed UK map (the point being that I didn't have to design this styling, it came with the data). I realise that other tools exist for paper mapping, but the same issues tend to arise at one stage or another... I'm more or less successful in making the tool work for me in really basic terms, but to get to something visually useful I end up back with me either needing to re-invent a complete rendering style from scratch (beyond my skill), or encountering such a complex set of requirements for database setups or whatever that the process crashes and burns before I get anywhere useful. With a few more years of GIS experience I'll maybe be a database, CartoCSS (or whatever else) wizz... but until then I'm prevented from using the amazing resource that OSM provides by this one barrier.  Update (July 2015): Please note that I'm still looking for information on this, and given that I've just been informed that the question has had 2500 views in the last year clearly others are too.