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Questions tagged [png]

Use this tag when asking questions related to, Portable Network Graphics (PNG), a bitmapped image format that employs lossless data compression

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Opening local XYZ Tiles source on QGIS

I am trying to add an XYZ Tiles source of a map that I downloaded in PNG format to QGIS. It has been cached with Global Mapper. It works very well with Global Mapper and SASPlanet, but it appears like ...
Thomas's user avatar
  • 41
0 votes
1 answer
168 views

Creating a GeoTIFF with PNG & XML [closed]

I want to make a GeoTIFF file to use in a navigation app. What I currently have is a PNG with the map and a XML that goes along with it. Does anyone know how to somehow combine them and export it as a ...
Lukas Nilsson's user avatar
0 votes
0 answers
59 views

Opening .png.aux.xml file in QGIS

I received a .png.aux.xml file. I have tried to read it with the GDAL translator and by making a URL from the code. I haven't been able to open the file in QGIS. Any ideas?
Pedro Castro Gomez's user avatar
2 votes
0 answers
354 views

React Native with offline maps

I am developing a React Native app functionality that will allow user to navigate with offline map. I had luck with react-native-maps package and raster .jpg tiles. The main downside is that tiles for ...
Andrei Shingirii's user avatar
1 vote
0 answers
76 views

What is the proper syntax in gdal_translate to change image.png to a geotiff by assigning latlong pairs to pixels?

I cannot find comprehesible documentation on how to assign latlon to pixels in an orthogonal image that must be made into a proper geotiff. INPUT kat.png (ORDINARY) OUTPUT kat.tif (GEOTIFF) 512px by ...
Molly's user avatar
  • 35
0 votes
0 answers
62 views

TIFF resolution decreases when opening it in the layout (QGIS)

I have a TIFF which I want to put in to the layout in order to add the legend etc. However, when I open it in the layout the resolution decreases significantly. I tried it with the TIFF as well as ...
Lina's user avatar
  • 233
1 vote
1 answer
82 views

Setting path for QgsLayoutItemPicture using PyQGIS

In PyQGIS I want to define a path for a QgsLayoutItemPicture. Example: project = QgsProject.instance() manager = project.layoutManager() layout = QgsPrintLayout(project) layout.initializeDefaults() ...
eagleadmiral's user avatar
0 votes
1 answer
197 views

Exporting four band TIFF for transparency (alpha channel) using ArcMap

I am using ArcMap 10.8. I try to add a fourth band with my TIFF to extract it by mask and NOT have a black box arroud with NoData values. In the end I need a four band PNG with transparency layer. ...
Frauke's user avatar
  • 59
0 votes
0 answers
37 views

Raster to Polygon is converting the entire image as one polyon

I am attempting to use the raster to polygon tool with a RF Propagation overlay that is in .png format. The png is tied to a KML for the georeferencing from its output software. If i leave the png ...
SA_Nerd's user avatar
0 votes
0 answers
94 views

ArcGIS Pro not reading PGW file

When I upload the PNG file into ArcGIS Pro it doesn't seem to access or read the associated PGW file. The error I get is that it has "Unknown Coordinate System" How do I go about correcting ...
Paul Martin's user avatar
1 vote
0 answers
183 views

Trouble with clipping a GeoJSON polygon from a PNG raster tile in a Django Python app with rasterio

I am currently working with a Django Python app that is associated with a PostgreSQL database where PostGIS is installed. There's a specific table in the database with a column of the polygon type, ...
ybz's user avatar
  • 11
0 votes
1 answer
129 views

Converting PNG to GTiff increases file size using Python

I am running this script to convert PNG to GTiff and tag it with coordinates and a crs of my choice. It works just fine but after the conversion the geotiff file is 177 MB (the png is 1 mb or smt) and ...
CEB420's user avatar
  • 1
2 votes
2 answers
1k views

Exporting Map Series to multiple PNGs using ArcGIS Pro

In ArcGIS Pro, how can I export a Map Series to multiple PNGs? in the GUI, there's an easy option to export to multiple PDFs, but not for PNGs. I found this article (under "MapSeries example 2&...
Felipe D.'s user avatar
  • 2,699
0 votes
1 answer
256 views

How to georeference a PNG in ArcMap without losing transparency?

I am creating a geologic map in ArcMap and I want to georeference a PNG of my topographic contours. I need to use a specific set of contours, so I cannot generate them within Arc. I have PNG file that ...
Andrew's user avatar
  • 1
1 vote
1 answer
247 views

Arcpy : setting DataFrame scale to export map over specific domain

I am trying to automate the export of a map to png over a given domain (SW and NE coordinates) in ArcPy (ArcMap version 10.7.1). I've searched a bit but fail at setting the correct automatized scale (...
thom_hlh's user avatar
0 votes
1 answer
82 views

The PNG image I created using GDAL's createcopy method looks 48-bit on Windows

I use GDAL ceatecopy() method to convert a 16bit TIF file to a PNG file. Why the PNG file generated is 48bit? But I can successfully display it on ArcGIS. Thumbnails on Windows are black.
keweizhou's user avatar
1 vote
1 answer
772 views

How to write a single band colored PNG in rasterio?

I am trying to convert a single band GeoTIFF file to PNG with pseudocolor. What I am trying to achieve is not a thumbnail but an image with geospatial reference that I can serve as an Image Overlay in ...
Nikko's user avatar
  • 611
0 votes
1 answer
218 views

Draw a polygon over PNG image R

I have a PNG image wich I have opened in R and in order to give coordinations converted into a SpatRast object with the following code: library(terra) r <- rast("yanomamis.png") #Warning: ...
Aniel's user avatar
  • 15
1 vote
2 answers
401 views

Read a PNG and JPEG image with world file in Java

I have a program where given an image I want to read the coordinates for each pixel. I have implemented the code if the given image is a TIFF image and it works fine. The code that gives me the object ...
Rute's user avatar
  • 31
1 vote
1 answer
2k views

Saving TIFF file as PNG with colour ramp

I have one TIFF image having the pixel value of 1 and 2. It's a classified image. I want to save the TIFF file as a PNG with heading and colour index for 1 and 2. I can able to plot the raster but ...
Asmita Guha's user avatar
1 vote
1 answer
233 views

QGIS 3.22 : Put some custom PNG icons on a map programmatically,to creare a tracker [closed]

I'm developing a framework using QGIS SDK. It must show some icons updated during time like a tracker. "Some boats on a map with different icons" I have also to perform a selection on an '...
Gab74's user avatar
  • 31
0 votes
0 answers
643 views

Images imported as symbol through Picture Maker have backgrounds using ArcGIS Pro

I am using ArcGIS Pro. I am attempting to upload a PNG image (Turbine 1 attachment) as a point symbol, however anytime I try to do this the image has either a fully white or black background. I have ...
Robbie-G95's user avatar
0 votes
1 answer
71 views

Embedded PNG with a transparent background not exporting in certain area of the map

I am using ArcMap 10.8.1. I've managed to find that an embedded PNG image (with a transparent background), whether saved as a part of a map or not, is not exported with the map itself in a right part ...
Barbora Lachová's user avatar
0 votes
2 answers
355 views

Is there any way to get the information in XML, or GeoJSON or in any text format for this ArcGIS from URL?

I have a URL like this https://arcgisserver.lund.se/arcgis/rest/directories/arcgisoutput/extern/Extern_Stadsplanering_MapServer/_ags_mapd3b02fb986704186a28a270abd0baff1.png Source Page https://...
Self's user avatar
  • 3
0 votes
0 answers
833 views

R : Reading KMZ and appending geography to polygon from png

Question: How do I make a png embedded within a kmz useable as a polygon? Context: I am trying to read a KMZ file generated by a free 3rd party tool and to make the .png image within useable as a ...
Mark O's user avatar
  • 1
0 votes
0 answers
278 views

Convert multiple PNG files to one JPEG

Here I have converted a .mbtile file to PNG. The output creates a main folder with multiple subfolders. Those subfolders contain multiple PNGs. I would like to convert all those PNG files to one JPEG ...
Donny's user avatar
  • 1
2 votes
1 answer
468 views

Should I use TIFF or PNG Maps [closed]

I have a school project in which I should forecast the UV index based on historical data in former UV maps. This website http://www.soda-is.com/pub/files/iresen/ includes the UV maps both in TIFF and ...
UV-Sam's user avatar
  • 39
0 votes
1 answer
478 views

Export PNG in QGIS, same extent but outputs are not exactly the same

I export the PNG with same extent, same resolution and scale but the output width are not exactly the same. It's quite annoying to me, and I have no idea why could this happen Are there any ...
Ll Nu's user avatar
  • 1
0 votes
1 answer
836 views

Georeferencing PNG from bounding box in GDAL?

I have an image in PNG format and bounding box coordinates (upper left, lower right). How do I georeference it using command-line interface tools such as GDAL (or Python if it is not possible)? In the ...
sutan's user avatar
  • 951
3 votes
1 answer
208 views

<geotools/HeatmapProcess> convert GridCoverage2d to BufferedImage

I got the heatmapprocessTest code from geotools github However, I can't confirm that the heat map is coming out well. Ultimately I want to create and save the heatmap as a BufferedImage. (png) For ...
user203217's user avatar
1 vote
0 answers
319 views

OpenLayers - Add PNG image static from local disk? [closed]

I have some layers in GeoServer, where I used the OpenLayers technology to act as a viewer for these. The code is the following: <!doctype html> <html lang="es"> <head> &...
MrShaggy87's user avatar
2 votes
2 answers
2k views

Converting PNG to GeoTIFF using GDAL Python

I want to ask how to convert PNG to GeoTIFF using GDAL in Python. I ran this code but it's not work and I want to export the output into my computer. How can I fix my code? ds = gdal.Open('input.png') ...
ghea ayunda's user avatar
0 votes
0 answers
386 views

Show map tiles made in MapTiler in OpenLayers?

I converted GeoTIFF to png-tiles using MapTiler. Here is the folder structure: Now I'm trying to add this folder with png-tiles to OpenLayers as XYZ source: var layer = new ol.layer.Tile({ ...
user13892757's user avatar
1 vote
0 answers
555 views

Export QGIS layout as georeferenced PNG image with PyQGIS

I am using PyQGIS to export a map layout like this exporter = QgsLayoutExporter(layout) settings = exporter.ImageExportSettings() settings.dpi = 100 path = 'C:/data/test1.png' exporter.exportToImage(...
JUNGLE's user avatar
  • 530
1 vote
0 answers
833 views

Saving 16bit raster to RGB PNG (or TIF) in QGIS

I was following this post here: Converting Grayscale GeoTIFF to PNG using QGIS results in all black image I don't want a grayscale but RGB PNG. When I do Raster->translate and select byte I only ...
Oliver's user avatar
  • 195
1 vote
2 answers
1k views

GTiff to PNG conversion- Gdal Python

I am trying to convert a Gtiff image to PNG using Gdal in python with gdal_translate. My gtiff has the following properties: Width 255 Height 255 Data type Float32 - Thirty two bit floating point ...
Karantai's user avatar
0 votes
0 answers
215 views

Only one image is showing up on OpenLayers map

I can only get one of the following DEM_image PNGs to show up on my map. Its always the first one "DSS.layer.DEM.image0" that shows up, the rest do not render. I can see in the console ...
Zach Hassler's user avatar
4 votes
1 answer
151 views

Gradients Changed on Export in QGIS when Coord Mode set to Viewport

I made a map in QGIS that includes a couple different gradients. Here you can see an indicator map that has a gradient fill enabled. (This image is from the print layout/composer.) (Here is the ...
Ben's user avatar
  • 405
1 vote
1 answer
330 views

Extracting all polygons from GeoTIFF raster layer as PNG images using QGIS

I have a GeoTIFF file with multiple separated polygons on it as the following: I'd like to find a way of extracting all these polygons as separated individual PNG images, just so I can have them as ...
raylight's user avatar
  • 1,163
2 votes
0 answers
341 views

Convert a one-band GTIFF to PNG with adjusted color ramp using GDAL

I have a one-band fCover GTiff with values ranging between 0 to 0.4 and I would like to convert it to a png using a color ramp adapted to this tiff. I already have a png from this tif but the color ...
Camille C's user avatar
1 vote
1 answer
287 views

Reading from PNG file in Java from using GDAL

I've used gdalwarp.exe to project a tif-file from EPSG:4326 to EPSG:32635 and storing it in the PNG-format: gdalwarp.exe -dstalpha -t_srs EPSG:32635 -s_srs EPSG:4326 -if GTiff -of PNG -et 0.125 -r ...
Paul's user avatar
  • 475
0 votes
0 answers
324 views

Is there a way to use QGIS' qgis:tilesxyzdirectory algorithm from a shell script?

I currently have a KML file which I upload to QGIS as a layer. From there I navigate the UI to Raster tools -> 'Generate XYZ tiles (Directory)' under the processing toolbox. For the EXTENT ...
steepcurve's user avatar
1 vote
1 answer
284 views

Looping through features in layer to zoom to feature and export to PNG using ArcPy with ArcGIS Pro

I have a shapefile with a large number of features with consecutive IDs, and I need to zoom in each one and export the map as a PNG file. I found a previous identical question where the code that was ...
Eladdave's user avatar
0 votes
0 answers
222 views

Fastest way to generate PNG tiles from a KML file

I have several KML files and each KML is being parsed, turned into a geometry with PostGIS' ST_GeomFromKML() and saved to a database. This database is parsed and uses ST_AsPng() to process each ...
steepcurve's user avatar
1 vote
0 answers
1k views

Converting GeoTIFF to PNG results in completely black image

I have a set of DEM tiles (TIFF format) retrieved from https://cteco.uconn.edu/data/download/flight2016/index.htm which I would like to convert to 16-bit PNG format so that I can use them as ...
Matt's user avatar
  • 111
0 votes
0 answers
85 views

Exporting very large map to image in QGIS [duplicate]

I'm trying to use QGIS 3.10.14 to create a hydrological map to edit (as a PNG) in image editing software. My purpose is recreational. I've paired the Copernicus EU-hydro river network with ESRI ...
Will's user avatar
  • 21
4 votes
2 answers
3k views

How to convert GeoTiff to PNG + World file in QGIS

I have quite a big area with DTM as a GeoTIFF. I want to save it to PNG with world file, but how to do it just in QGIS? I know I can export view to PNG with world file, but it looses quality (Project/...
Lynx's user avatar
  • 81
0 votes
2 answers
275 views

ArcPy exporting maps to PNG problem - raster DEM does not show up in exported map file

I sm using ArcGIS Desktop (ArcMap) 10.8.1 and PyCharm 2020.3.3. I'm trying to use a simple script to loop through a folder and export a PNG file for each MXD in the folder. The script works fine, and ...
S Koenig's user avatar
2 votes
0 answers
116 views

Do PNG files suffer performance for scaled read over ERDAS Imagine (.img) files?

So I have a 20 GB in size Raster Image in .img format. Though I will be examining the code, to find out why, I am AMAZED at how quickly QGIS renders the entire file in a scaled format, and prior to ...
John Sohn's user avatar
1 vote
0 answers
293 views

How to request GeoServer elevation data from GeoServer to PNG file with the minimum loss of precision

I'm requesting alt data on GeoServer from a layer group as a PNG file. The colormap of the style associated with the layer is the following : <ColorMap> <ColorMapEntry color="#...
bellot nicolas's user avatar