raster

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Convert a raster image into a polygon using QGis (or another method)

I want to convert several images into polygon shp files using QGis (Quantum GIS 1.6). I need to do edge detection AND differentiate between several different colors of lines (red, green, yellow and b[详细]

2023-04-08 16:29 分类：问答
cycling through folders creating a spatial index

I\'ve created a script to create a spatial index of all rasters and it worked fine when run in a single directory but when I tried to ammend it to run on subdirectories as part of an os.walk it starte[详细]

2023-03-29 11:58 分类：问答
Display Dynamic Raster (lidar) Data on Web Map like Geoserver, Bing Maps, Google maps from Ground up

I have some high quality LiDAR data. I need to process it dynamically, and update a field (not elevation field) depending on my input and elevation at that point. Once this is done, I need to display[详细]

2023-03-29 02:24 分类：问答
save file in XYZ format as vector (GML or shp)

I am using QGIS software. I would like to show value of each raster cell as label. My idea (I don\'t know any plugin or any functionality from QGIS which allow to it easier) is to export raster using[详细]

2023-03-26 17:31 分类：问答
Find out pixels of an image under a vector

This might be a simple problem but I can\'t manage to solve it. I\'ve got this heightmap which I need to process. I must allow the user to trace a vector over an image, indicating which \"line\" of开[详细]

2023-03-23 15:14 分类：问答
How to improve a spatial raster map using ggplot when compared to spplot?

How can I improve the legend of spatial raster map plot using ggplot when compared to a spplot() legend?[详细]

2023-03-23 09:40 分类：问答
Ghostscript and PDF with fonts not embedded

My system config is OS X with GhostScript 9.02 I would like to know (step by step) how to add and configure the file in GS that make p开发者_如何学运维ossible to do substitutions for fonts.[详细]

2023-03-17 04:33 分类：问答
Imagemagick - PDF to Jpeg/Raster texture issue

I am using imagemagick/php to make a jpeg file from a PDF. Input PDF file: PDF-file Output Jpeg file: Jpeg-file[详细]

2023-03-11 19:58 分类：问答
Conversion of a byte[] BGRA array into something more useful/speedy (JAVA)

I have a byte[] array that contains BGRA raster data (e.g. first byte = blue component, second = green, fifth = next pixel, blue) and would like to play with it.[详细]

2023-03-06 17:49 分类：问答
ploting artefact with points over raster

I noticed some weird behavior when resizing the plot window. Consider library(sp) library(rgeos) library(raster)[详细]

2023-03-05 15:11 分类：问答