geotiff

问题 I would like to use the original colortable of a >>georeferenced raster image<< (tif-file) as coloured scale in a map plotted by ggplot/ggplot2 . Due to not finding an easier solution, I accessed the colortable -slot from the legend -attribute of the loaded raster image (object) raster1 like so: raster1 <- raster(paste(workingDir, "/HUEK200_Durchlaessigkeit001_proj001.tif", sep="", collapse="")) raster1.pts <- rasterToPoints(raster1) raster1.df <- data.frame(raster1.pts) colTab <- attr

问题 I am trying to use libtiff.net to read elevation data from a GeoTIFF file. So far I have mostly just been able to read metadata from the file using the example at libtiff.net's webpage. But howto read elevation data I do not understand... I tried first reading with Tiff.ReadScanline() as described here but the file I have seems to be stored differently (probably in tiles if I understand it correctly) Here is the metadata (as far as I have been able to read) (the tiff file is from the danish

问题 I have a GeoTIFF image that contains a color table and a single raster band with 8-bit table keys, and that uses LZW compression, that I load with gdal.Open. I also have a numpy array containing 24-bit RGB-values (for a blurred version of the image), corresponding to three 8-bit raster bands. I need to substitute these three raster bands for the raster band that is currently in the image, and then save the image (preferably as a new file if possible). How do I do that? I would like to keep

问题 For visualizing some geodata, we set up a small webserver running leaflet. All works fine, markers and polygons are shown as expected. Now we also want to show large raster files (stored as GeoTiff) as RGB on our map. We have full control over the tif files, we host them ourselves and we can store/process them in any way we want. Still, as they can get rather big in size (up to 30.000x20.000 pixels, three bands) , we are wondering what the best way to do that is. Options we researched: Just

问题 I faced with problem that I can't to display any .tif image on my map. I'm using leaflet-geotiff plugin for my map. I downloaded the file (for example from gis-lab.info, here is link to download) and tried to paste and display on my map. But I always get Custom Mask is off screen. Here is a sample how I use it: import * as geotiff from 'leaflet-geotiff/leaflet-geotiff'; import * as plotty from 'leaflet-geotiff/leaflet-geotiff-plotty'; export class MapComponent { ngOnInit() { this.map.on('load

问题 I would like to read a gzipped GeoTIFF from a server without downloading it. I just don't want to create a lot of temporary files that I have to delete later on. I see it is possible with .csv.gz files. With download I do it in the following way: library(raster) link <- "ftp://ftp.glcf.umd.edu/glcf/SRTM/Degree_Tiles/n000/SRTM_ff03_n000e010 /SRTM_ff03_n000e010.tif.gz" download.file(link, "test.tif.gz") gunzip("test.tif.gz") myras <- raster("test.tif") plot(myras) I can read an uncompressed

问题 Hi i been trying to reproject a raster image from Equirectangular to EPSG:4326 (Latlon), the issue is that every time i run my code on R, i get the wrong coordinates on the new image; i don´t know where is the error in the code, also i do the same process with Qgis, and i got the same result, it´s strange, i got the opportunity to do the same reprojection process in ENVI, and the result was succesful, help please!!! a <- raster("C:/Users/<username>/Documents/imageexample.tif") > a class :

问题 i have a geotiff images that have 3bands. band1,2 is a actual image values and band3 is a instance angle value. band1,2 is float32 data type under code is that i try before. but it doesn't work. i think band data's range is too large, so it doesn't from osgeo import gdal, osr, ogr from PIL import Image import numpy as np ds = gdal.Open('image path', gdal.GA_ReadOnly) rb = ds.GetRasterBand(1) test = rb.ReadAsArray() rb2 = ds.GetRasterBand(2) test2 = rb2.ReadAsArray() rb3 = ds.GetRasterBand(3)

问题 I'm new with working with reading tiff images and I'm trying to get the elevation terrain values from a tiff map by using LibTiff. The maps I need to decode are tile organized. Below the fragment of the code I'm using currently to get these values, based on the library documentation and research on the web: private void getBytes() { int numBytes = bitsPerSample / 8; //Number of bytes depending the tiff map int stride = numBytes * height; byte[] bufferTiff = new byte[stride * height]; // this

问题 I have a geotiff file which I am loading into a QPixmap with QPixmap::load( ). I get the following warnings printed to the console a bunch of times. However, direct use of libtiff opens it without warnings. Any ideas on how to alleviate these unsightly warnings in QT? TIFFReadDirectory: Warning, foo: unknown field with tag 33550 (0x830e) encountered. TIFFReadDirectory: Warning, foo: unknown field with tag 33922 (0x8482) encountered. TIFFReadDirectory: Warning, foo: unknown field with tag