A bitmapped image format that employs lossless data compression

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1answer
42 views

highresolution images from geoserver get scaled down

I uploaded a 300 dpi png (2024x1012) as world image to my geoserver. The image/map is displayed as WMS layer on a virtual globe in an android app. Unfortunalty, the layer on my globe gets pixelated ...
1
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0answers
23 views

TileStache PNG Optimization

A Tilestache config file has a "png options" object that passes its config straight through to the Python Imaging Library (PIL). Setting optimize: true does some kind of optimization as the file is ...
0
votes
1answer
34 views

How to get a PNG image of a polygon with the corner coordinates?

How to get a PNG image of a polygon with the corner coordinates in a separate file? I have access to ArcGIS 10.1 and QGIS 2.8.1. I tried this: http://gis.stackexchange.com/a/30503/50606 , but I get ...
0
votes
1answer
118 views

OpenLayers3: How to show a KML layer with the export to png Button

so... I have this script: <script> //Script1: Script de criação do mapa. var map = new ol.Map({ layers: [ new ol.layer.Tile({ ...
1
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0answers
76 views

create image out of geojson (gdal_rasterize?)

Short version: I need to know how I can convert a .geojson-file to an according .png-file (or any other image format) long version: I have a .geojson which was created by gdal_polygonize from a .png ...
1
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0answers
48 views

QGIS Atlas generation - Export atlas as images - only JPEG, want PNG

I can't find an option to choose image format while exporting Atlas, choices are Export atlas as images / as SVG / as PDF The dialog that opens has no options and it always exports as not so good ...
0
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0answers
33 views

ERROR 6: The PNG driver does not support update access to existing datasets

I was trying to overlay a shapefile to some raster images from a directory using gdal_rasterize. But then encountered this error ERROR 6: The PNG driver does not support update access to existing ...
2
votes
1answer
155 views

How to save the Map Canvas as PNG with transparent background programmatically?

I wrote a script to create a big number of heatmaps for a given scenario. I would like to save the result of every heatmap as a png image. I have figuered it out doing it with simple Map Rendering but ...
0
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1answer
83 views

Converting raster presented in KML to polygon using ArcGIS Desktop?

I have spent quite a lot of time Googling which brought me many places including this site, but I haven't found the resolution. I have a KML that presents a PNG. Radio Mobile generated the files and ...
0
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2answers
62 views

Why are my transparent png tiles showing up weirdly in QGIS?

I have Ubuntu 14.04 running QGIS 2.6. I'm loading a raster layer, but the transparent PNG shows up poorly. The black lines along roads aren't showing up and the anti-aliasing looks off. I'm thinking ...
0
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1answer
30 views

Transforming a PNG from RD_new to WGS84

I got the request to transform a PNG in RD_new to WGS84. Is this possible? I was thinking of changing the accompanied world file its coordinates. I do not think it is possible to load in a png in a ...
0
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2answers
144 views

OpenLayers: png as external graphic marker

I would like to style my point features. For some markers I use the convenient OpenLayers.StyleMap options, for few of them I would like to use an external png graphic (the camouflage circle). I use a ...
0
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0answers
36 views

Files generated with QGIS are invisibles for my system (windows 8.1) How can I Solve this?

My use of QGIS is basic but very important in my job. My final product usually is a Cartographic map (PNG or BMP image). Since the last updated (QGIS 2.6.1 Brighton) I have problems with every file ...
0
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0answers
31 views

increase gdal_polygonize's capacity

I have a very big PNG (82500x40900) with more than 5000 polygons. I want to use gdal_polygonize but the geojson output shows that gdal_polygonizer stopped after 4770 polygons and the geojson isn't ...
0
votes
1answer
46 views

eliminate small polygons of a PNG with gdal_sieve

I want to eliminate polygons wich consist of less than 3550 px in this PNG . I tried using gdal_sieve but there seems to be an error. gdal_sieve -st 3550 E8.png -of PNG E8sieve3550_4.png ERROR 6: ...
0
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0answers
48 views

PNG from Geoserver size on Google earth seems uncontrollable

I have set up a geoserver instance that hosts a lot of data that we process at work. It seems to be the easiest way to distribute since I can provide a simple network link to the geoserver so that ...
1
vote
2answers
334 views

Exporting GIS Images with Transparency

I'm trying to export some images of Gulf of Mexico infrastructure that will later be used for non-GIS purposes as overlays onto sea current/weather maps (likely in photoshop). I have no clue how to ...
0
votes
1answer
42 views

gdal_polygonize unable to open PNG

I use OSGeo4W on Windows 7 (64 bit) and included libpng16.dll When I try C:\OSGeo4W64\bin>gdal_polygonize star.png bla I get the following error: ERROR 4: `star.png' does not exist in the file ...
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0answers
74 views

Extract polygons of PNG with GdalOgrInJava

I have PNG pictures with polygons of different colours on them. What I plan to do is to extract these Polygons using the polygonize function (see here) Then I will try to encode the polygons in ...
1
vote
1answer
1k views

Convert PNG to GeoTiff using GDAL

I have a map portion PNG and its associated PRJ file. I want to convert the PNG to a GeoTIFF. I know how to convert a PNG to a GeoTiff if the bounding box is available: gdal_translate -of Gtiff ...
1
vote
1answer
286 views

Add kml file with associated png images as openlayer layer

I have private sonar data in kmz format, and can easily produce more. I understand that OpenLayers cannot use kmz files, so my question is if it can handle the uncompressed kml file with all the png ...
2
votes
1answer
592 views

How to insert georeferenced PNG into correct location in AutoCAD Map3D?

I have a PNG of building plans that I will need to digitize in AutoCAD Map3D. I have georeferenced the PNG in ArcGIS, which has produced a world file (.pgwx) in the same directory in which the image ...
2
votes
1answer
75 views

Efficient way to provide cached tiles? [closed]

I am creating an app in Android that requires cached areas. I allow the user to cache an area of reasonable size. The server provides these tiles in a zip in the format /z/x/y.png. I took a (very) ...
0
votes
1answer
537 views

Where can I find a good Mbtiles to png tiles converter?

I'm trying to create a slippy map and I need to obtain png tiles. I have exported a .mbtiles file from TileMill and I tried several python scripts to convert this file into png tiles but I always end ...
0
votes
1answer
102 views

Georeferencing PNG against Google maps with openlayers plugin

I am trying to georeference blueprints to the footprint of a building. I'm using the Google Satellite image from the plugin to do this. The blueprints are rotated about 30 degrees. When I run the ...
0
votes
0answers
197 views

QGis, how to overlay and correctly position and scale a KML and image onto a Google base map

Being totally new to the entire GIS subject I managed to install and get runnning QGis (2.2.0 on Mac) properly, get my Google Maps showing (I set the the CRS to WPSG:3857) and I also got my KML file ...
1
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0answers
58 views

using gdal2tiles 2 tile a png longlat. keep getting wrong coordinate box in google kmls

I have tried lots of variations, but can't seem to get gdal2tiles to do what it used to do. Prior version? images are 60N to 60S and 180W to 180E 9000 pix x 3000 lines. gdal2tiles keeps outputting ...
0
votes
0answers
100 views

Fantasy map, how do i slice large png and georefrence it the right way?

Im and IOS developer working on a map based ios game, and new to GIS stuff. I've read a lot of info and i started to get a hint about what i need to do in order to meet my goals. I have a png map i ...
2
votes
2answers
321 views

Export to Mapbox (TileMill) from PSD (or SVG/PNG)

Newbie question: I designed a map (not Earth-related) in Photoshop and I want to use something like Mapbox to serve the map and make it dynamic (bounding boxes, zoom in/out, etc). How can I go from an ...
0
votes
1answer
463 views

How can I correct a .pgw file for a PNG image?

I have a PNG file and I need its .pgw file to be set with NAD 83 as the projection. I have created a .pgw file: 799 0 0 -799 -122.562 37.1946 However when I open the PNG in QGIS or ArcMap 10.2 it ...
1
vote
2answers
366 views

Where to find Icon library for custom GIS software?

I am building a desktop application and currently utilizing a mix of icons for pan, select, zoom, attribute table, etc that have been randomly taken from the internet and modified. The overall look ...
3
votes
2answers
321 views

How to use user made png/jpeg icons in QGIS 2.0?

I can only add svg icons in qgis 2.0. How can i use png or jpeg or gif images as icons in qgis2.0?
1
vote
1answer
286 views

Map Layout Elements In New Layer Automated Using Python

I was wondering if there was a way to put a title and integer data from an attribute table in a new layer created in Python. I was able to create a new layer using copy features, zoom to the selected ...
3
votes
1answer
727 views

How can I get the GPS info from a PNG?

I am trying to get the GPS data from several hundred PNG photographs for display in Q GIS (so need to access the EXIF data). The online and downloadable viewers I have tried haven't yielded much ...
3
votes
2answers
2k views

How to export a mxd to a image with transparent background

I cannot get ArcMap 10.0 or 10.1 to "Export Map" to a png or gif with a transparent background -- no matter what I set the background and transparent colors to. Thus, I created the following script, ...
1
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0answers
653 views

How to generate JPEG tiles using gdal2tiles.py

I am using gdal2tiles.py to generate tiles and packing it into MBTiles using mb-util. gdal2tiles by default generates PNG tiles. When I convert PNG tiles to JPEG large black area around tiles are left ...
0
votes
1answer
298 views

How to export multiple MXDs to PNG without using VBA?

Okay, so I can feel that I am so close to solving this issue with the help of Jason (below) but I have modified to use as a script. The GetParameterAsText returns the following error when trying to ...
1
vote
2answers
524 views

Having problems creating VRT in QGIS from png files

This is similar to a question asked by someone else, re OS tiles, however, there is a difference! I am a bit of a amateur in GIS and python, but if I take it slow I can usually just about work it out! ...
7
votes
2answers
2k views

How do I use QGIS python console to iterate through simple layer queries and png outputs?

I'm really new to QGIS coding and I'm having a hard time finding (especially) the api classes/functions to carry out actions of the Query Builder window. I'm basically trying to do this: Iterate ...
4
votes
1answer
1k views

GeoTiff convert to PNG with transparency?

I need to convert a GeoTIFF image to PNG format with "NoData" pixels in the original image being transparent in the output. Is there any tool particularly in ArcGIS ArcToolbox or GDAL for this ...
1
vote
1answer
186 views

Is it possible to export raster data from PostGIS or MapServer as a base64 string?

Is it possible to output a PNG in a base64 string so that can be directly loaded into a browser? I've read through the PostGIS documentation which refer to the GDAL output formats. The GDAL output ...
3
votes
2answers
393 views

How should I get a Raster out of ArcMap and into Google Earth (.kmz) with transparency

RasterLayerExportClass will only create a .png with a single value transparency, however there is a bug in Google earth which prevents this from working. The other export options don't support ...
2
votes
2answers
926 views

How to render a multi-layered (raster + vector) map to a file (PDF, SVG or JPEG, PNG)?

When using OpenLayers I can compose a map with several layers which is displayed nicely by my browser, but I need to do the same server side (no browser composing the layers), and I'm waiting a image ...
0
votes
4answers
3k views

How to plot a point on a static Google map [png]?

map&markers=color:blue%7Clabel:S%7C40.702147,-74.015794&markers=color:green%7Clabel:G%7C40.711614,-74.012318&markers=color:red%7Ccolor:red%7Clabel:C%7C40.718217,-73.998284&sensor=false ...
4
votes
1answer
790 views

Using PNG/JPEG Compression in GeoServer

Is there any use in setting the PNG and JPEG compression in GeoServer (Services - WMS - PNG Options/JPEG Options)? The default is 25, but we heard rumours that having compression resulted in a time ...
1
vote
0answers
151 views

How to call a PNG file with MapServer and a Google base layer? [closed]

How can I call a png file from map path including a Google map as base layer? I'm working with MapServer and I have some shapes made with Quantum GIS and ArcView. I can call those shapes in a url and ...
1
vote
1answer
610 views

How to create a worldfile by bounding box?

I need to create a worldfile from Bigmap Application. I've successfully to grab a pack of PNG tiles and the pearl app mosaicking all in one. The BigMap site shows the raster bounding box and util ...
1
vote
1answer
272 views

How do I make a more Bandwidth-friendly map overlay?

I performed a map overlay in Google Earth then saved the overlay as a KMZ file. Then logged into my Google Maps account and uploaded that KMZ file so the map overlay would appear on Google Maps. The ...
2
votes
2answers
2k views

How to create dynamic map images?

I have map images of my local ward (Areas geo-referenced and drawn using QGIS and Adobe illustrator. Now these maps are in .png format (Raster images). It's not a tile linked to some mapserver such as ...
3
votes
2answers
1k views

ImageMagick's convert program changes PNG file format so that color/alpha info doesn't survive GDAL

It appears that ImageMagick's convert program changes something in my PNG file that causes GDAL processing to mess up the color and/or transparency bands. My original PNG file gets processed ...