Resolution is a measure of the smallest unit or sample in data that can be distinguished from any other, and/or the number of samples for a given unit.

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What resolution will be able to show visible changes on a parcel of farm land? [on hold]

What resolution will be adequate (5m, 2.5m, etc) to show visible changes on a parcel of farm land? Each plot is typically the size of two football pitches. Details to detect: a) has the farm land ...
4
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1answer
59 views

30m/10m/1m resolution DEM for microtopography research

I am conducting research in a region of Illinois that does not have a LiDAR dataset. I am looking to develop a fine scale habitat species distribution model; however, the coarse data available ...
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2answers
38 views

Why 1 cm is 1 km in my map? [closed]

I have this map in ArcMap (you can download my map document from here), and I don't know why, but if I set the scale to 1:1, I can see my whole city. When I used the measure tool, I found out that ...
4
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1answer
30 views

Grid size of a Digital Elevation Model developed from topographic surveyed elevation contour line?

I have generated a Digital Elevation Model from elevation contour line. I got these elevation contour line at 20 cm interval from DGPS survey. What would be the grid size of generated DEM in "m". ...
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2answers
43 views

Sentinel-1A and Lansat-8 Resolution difference

Sentinel-1A level-1 high resolution GRD data have 20X22m resolution (rgXaz)with 5X1 number of looks. While Landsat-8 data have 30m resolution. My question is how can I compare the resolution ...
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3answers
124 views

What is the difference between DEM data sources?

I have started experimenting creating basic 3D elevation models in QGIS recently. It turned out for me that there are several free sources of DEMs, like USGS's EarthExplorer, CGIAR-CSI's Digital ...
2
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1answer
36 views

LANDSAT 8 Resolution too low for coastline difference measurement?

I recently extracted coastlines (for my master thesis) for a Bangladesh region for the years 2013 and 2014. Regardless of the method I used, the distance between the 2 coastlines was always the same: ...
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38 views

calculate area using pixel count (ArcMap)

I have been trying to research solutions and solve my problem for a while now, without success. I have a raster file with 2 layers, namely 0 and 1. My attribute table includes the pixel count for ...
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0answers
28 views

ArcMap maintaining raster cell size when using math?

I have a raster created from importing xy data (it has lat, lon, and a value field [WGS84]). The raster resolution is 60 meters as that's my required accuracy and for my value field I'd like to ...
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61 views

Geographic vs. projected raster cell size area

I am wondering the best way of knowing how to define the area of each raster cell in global data. Specifically, I downloaded all ~400 tiles of MODIS land cover data, mosaiced them into one, and now am ...
2
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1answer
32 views

Using gdalwarp to remove one row of pixels or add one row of pixels

I am trying to use GDAL_calc but my two rasters are off by one pixel in the y dimension. One is 256005 the other is 256004 so GDAL_calc fails with a multiplication. Is it possible in gdalwarp to ...
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1answer
33 views

Transforming a .txt file into a raster in R

I have a .txt file which consists of 160 rows and 320 columns. It covers the geographic region from 34 to 41.95 in latitude and 19 to 34.95 in longitude. Its spatial resolution is 0.05 x 0.05. I use ...
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37 views

problem with raster calculator results when subtracting two rasters with different resolutions

I have two elevation datasets which I am trying to subtract to calculate thickness (using ArcGIS raster calculator). The first datset is a tif which is oriented north-south and has a cell size of 5 ft ...
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0answers
88 views

Openlayers-2 restrict zoom levels relative to restricted extent

I have a web application that uses Openlayers 2.13.1 to open a map with many zoom levels defined by a resolutions array. Each user can have a different restricted extent where the user can move ...
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0answers
31 views

Retaining resolution of MODIS data while reprojecting using gdalwarp

Can anyone help me to use gdal(gdalwarp specifically) for reprojection? I am using it to reproject MODIS data : I originally have an hdf file - MCD43A4.A2005001.h08v05.005.2007351192333.hdf which has ...
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2answers
58 views

Difference between Ground Sampling Distance and pixel size in RapidEye

I am a bit confused about reading technical specifications on RapidEye satellites. I assumed that Ground sampling distance (GSD) and pixel size express the same meaning, while GSD is 6.5 m, and pixel ...
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28 views

Resolution changing between mosaic dataset and output from mosaic to new raster tool viewed in ArcScene?

ArcScene cannot accept the mosaic dataset (Raster 1) so I used the Mosaic to New Raster tool to create a raster (Raster 2) that we can use in ArcScene. The problem which I face is the resolution in ...
2
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1answer
158 views

High resolution screen on ArcMap?

I have an Asus ZenBook Laptop with a 3200 x 1800 touchscreen, i tried enlarge icons but the ArcToolBox and other icons not fit on a 13.3 inches display. Other "more common" apps that do not have much ...
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57 views

Digitizing scale when digitizing from Bing imagery service in QGIS

I need to digitize a bunch of islands from imagery in QGIS. It is the Bing Maps aerial imagery layer. I will obtain all required permissions. My plan is to lock the map scale at 1:25,000 and use heads ...
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47 views

OpenLayers Layer.Vector with external graphic image overlay - scale help

I have this image overlay that has a lot of dynamic features associated with it, which are coming from a JSON file that's updated regularly with live data. I believe I need to use the Layer.Vector ...
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27 views

More pythonic approach to resolution increase of point locations

Excuse my first question being slightly more Numpy and less actual GIS, but it relates to latitude / longitude so I thought I'd give it a shot. Problem: I have a flat file with latitude and ...
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2answers
146 views

Geoserver/WMS: get original raster image in highest resolution

I am using the WMS interface of Geoserver to retrieve raster data. The raw raster data is stored in an oracle database and based on the WMS bbox parameter and height/width geoserver decides which zoom ...
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1answer
89 views

Resample not changing the cell size

I am trying to use the Resample tool in Spatial Analyst to go from a 1kmx1km grid to a 500mx500m grid for increased resolution of my land use data. My cell size is 0.008, and I want a 0.004 cell ...
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1answer
45 views

increase resolution of generated hillshade on QGIS

I want to export a hillshade (geotiff) created from a DEM as an image for printing. But the resolution of the hillshade is way too low (900 colums, 1450 lines). Any way to upscale it? (I tried ...
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100 views

How add two coverages with different bounding-box and different resolution using geotools

I'm developing a Java application with some spatial analysis operations. One of the operations is to add two coverages. But how can I add two coverages with different bounding-box and different ...
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2answers
406 views

What's relationship between pixel spacing and resolution?

Let's take as an example the Sentinel-1 SAR satellite for which data is accessible online. The pixel spacing in the range and in the azimuth are found inside the xml files bundled with the product. ...
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1answer
212 views

How to arrange own tiles without projection in OpenLayers 3?

I have own tiles (.png) of 512x512 pixels and I would like to display them in OpenLayers 3 without projection (for now). Therefore I found a way to use the ZOOMIFY projection but with a ...
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2answers
117 views

Suitable raster format for elevation data with sub-meter accuracy?

I've got some elevation data represented in ascii gridded xyz-files which I want to convert to a conventional raster format. What's a bit special is that the elevation values have sub-meter accuracy, ...
3
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2answers
321 views

Snapping raster grids in R

I am trying to align two raster grids in R. Once aligned I would like to be able to add them together. I have tried to check whether making a stack would work: grid_snap <- stack(habi_sdw, ...
4
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1answer
184 views

Clip raster by raster with data extraction and resolution change

I need to stack multiple maps (tif) together and clip them all according to extent of one small raster map (second raster at the top of picture below). However, the size of pixels in each map is ...
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1answer
272 views

Why is azimuth resolution worse than range resolution in Sentinel1 (SAR) [duplicate]

Why is the azimuth resolution in Sentinel (SAR sensor) worse than the range resolution? The table in this link gives the resolution for SLC products aquired in the different aquisition modes. In ...
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2answers
156 views

Why does the resolution decrease with increasing incidence angle in the Sentinel-1 SAR sattelite

On this link (Sentinel1 webpage for a SLC product), the resolution is written as a range from the highest corresponding to low incidence angle, to the lowest resolution corresponding to high incidence ...
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53 views

New Issue with Open Layers Plugin Google Satellite - low res?

Recently I've noticed this issue with the open layers plugin google satellite layer where the imagery is dark and of a lower-resolution than it used to be. I frequently use this imagery with ...
2
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1answer
266 views

How to export the map in very high resolution

I made a map in QGIS. Now I want to export the resulting image (layers upon layers) for further processing in GDAL. The print composer only lets me export an image up to a fixed size. If I try to ...
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0answers
78 views

Reducing cell size of DEM for processing reasons?

I need to calculate the solar radiation for a region of interest, and I am using the 'solar radiation' tool implemented in ArcGIS (10.1) and a DEM with cell size 1x1. It is 3 days now that ArcGIS is ...
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1answer
40 views

Spatial Resolution Reprojection - rom Angular to Rectangular Values with GDAL?

I have an image in a WGS 84 / No Defs projection. I can get it spatial resolutions in angular units for X axis and Y axis through geotransform parameters. If I would reproject this image into WGS 84 ...
3
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1answer
162 views

Downsampling Geotiff using summation - Gdal/Numpy

I am trying to downsample a 1 square km raster dataset to a much larger (.5 degree x .66 degree) dataset by summing all of the pixel values within this large grid cell. gdal_warp does not contain a ...
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2answers
141 views

How to produce a finer resolution spatial grid from coarser grid in R?

I have a spatial grid of an image. Now I want to use this grid and make a finer resolution grid out of it. For example an image structure in R is given below: str(c) Formal class ...
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2answers
64 views

Unable to set raster surface resolution in ArcScene?

I have a 3-band subset of a Landsat image which I want to display in ArcScene (of ArcGIS version 10.2.1). The image is 30 meter resolution and I am draping it on a 25m resolution Aster DEM. But have ...
0
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1answer
143 views

Setting ArcMap layout size based on web unit (pixel) standard?

I need to export my map from ArcMap as SVG and display it on a web page in an exact size of 500x500 pixels, like this: <div id="mapSVG" style=" width: 500px; height: 500px;"></div> Can ...
2
votes
1answer
147 views

Why does my hillshade .ovr display in lower resolution in QGIS?

I have viewed a lidar terrain model hillshade .ovr file on QGIS and Arc and Arc has significantly higher resolution than QGIS. Any thoughts as to why this would happen and ways to enhance resolution ...
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0answers
155 views

World DEM vs ASTER Digital Elevation Models accuracy

I use DEM essentially to create surfaces on AutoCAD Civil 3D and then to create terrain profile views. I have been using mainly ASTER imagery from which I extract 2m contour lines in QGis and then ...
2
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1answer
332 views

Relationship between contour interval and spatial resolution of a generated DEM

If I have contour lines with interval say 10, 5, or 2 (etc.), and I generated a DEM from them, what is the relationship between between the contour interval and the resolution of the DEM? Irrespective ...
2
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1answer
53 views

How to interpret BUFR descriptors

I'm processing BUFR products from Eumetsat and I would like to ask for your help about the following descriptors: 002028 SEGMENT SIZE AT NADIR IN X DIRECTION 002029 SEGMENT SIZE AT NADIR IN Y ...
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1answer
87 views

Resolution problem in QGIS raster

I have a raster file I need to clip. I created a virtual raster which I used to "copy" the extent from in QGIS raster calculator. As a result, I get the raster with the extent I need, but pixel size ...
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1answer
101 views

Resolution problem

I have a Landsat TM image and in QGIS I used Clipper to crop my image. Then, I tried to reprojected it via Warp (Reproject) and the pixel size goes 29.9936,-29.9936. I do not understand why this ...
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0answers
291 views

How to export a high resolution .tif of a map with QGIS Print Composer

I have an high resolution image of a map in QGIS using the print composer. It has 300dpi and the final map would be near 12gB big. The system is a virtual server with 128gb RAM, means there are no ...
0
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1answer
57 views

Reduce raster resolution based on cell ratio

I have 2m impervious/non-impervious data. I would like to reduce the resolution to 30m and have the cell value for the 30m data be determined by the ratio or proportion of impervious / non-impervious ...
2
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1answer
121 views

Is there a better way to convert Raster to Point data? Don't need one point for every cell

I need to convert raster data to point data so I can use the points for interpolation via kriging. My problem is that my resolution is 5 ft and I'm working on a whole city. The data I am converting ...
3
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2answers
240 views

High resolution satellite

Can any one tell me from where I can buy commercial High resolution Satellite images for Biodiversity research ? I need some websites that sells these kind of images ?