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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29 views

Determining scale of downloaded data (shapefile, raster, etc)?

When downloading digital data (either shapefile, raster, layer, GDB etc.) how do you determine the scales? Is there a simple way? I know scale definitions are different for geographers and ...
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17 views

Problem in cell dimension assignment from “save as” in QGIS

I am trying to save one raster in QGIS by changing the cell dimensions. I select 30 x 30 as cell resolution, but then the output raster has a resolution of 29.9985 x 29.9985. How can I assign exactly ...
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1answer
36 views

How to get a good resolution Image from google earth and use it in Arcmap?

I need to make an orthophoto from google-earth. My orthophoto covers a large area and whenever I save the image in google-earth and put it in the Arcmap to rectify it , the image has very large ...
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1answer
21 views

increase resolution of gps track (roads)

I've got a group of fairly low resolution gps tracks which follow a bunch of roads. I am trying to improve increase the number of points. I tried passing through a catmull, but that resulted in large ...
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0answers
54 views

Resample raster to lower resolution

I am trying to resample a forest cover raster with high resolution (25 meters) and categorical data (1 to 13) to a new RasterLayer with a lower resolution (~ 1 km). My idea is to combine the forest ...
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1answer
29 views

Landsat 8 composite image using different resolutions?

I have created a composite image of Landsat 8 using bands 2 to 7 (blue, green, red, NIR and SWIR) using ArcGIS 10.1. For bands 2-4, I've pansharpened them to 15m spatial resolutions using the ...
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1answer
44 views

How to interpret cell size arcgis

I have a raster layer that has cell size(x, y) 0.008928, 0.008928. I download it from the website as 1km resolution data under WGS_84. I can not find the unit for these numbers in the metadata. Is ...
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0answers
18 views

DigitalGlobe resolution not correct

I have Digital Globe imagery downloaded as geographic, and as a geotiff. I put it in both ArcGIS and QGIS and the pixel size (x/y) says it is 0.00014372049 (but 10 meters when I measure it with the ...
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0answers
41 views

The size of the SRTM raster data cells?

The size of each cell of the SRTM 1 arc-second raster data is: 1 x 1 arc-second = 0.00027 x 0.00027 degrees. But of what? 0.00027 degrees of latitude x 0.00027 degrees of longitude? or 0.00027 ...
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1answer
71 views

QGIS 2.14.3: I'm having problems when exporting my map to jpg

I am using QGIS 2.14.3 and I'm having problems when exporting my project to jpg (also when trying to export to pdf...). I have several shapefiles opened, they are basically polygons on a shapefile ...
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1answer
53 views

Converting resolution to meter using ArcGIS for Desktop?

I have data in the following format: Projection: Latitude-Longitude | | N: 46:08:44N S: 45:54:50.666667N Res: 0:00:00.333333 | | ...
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74 views

openlayer 3 add TMS layer in UTM projection

I have a TMS layer in UTM zone 39. It worked in openlayer 2.10 but not working in openlayer 3. This is the way I added the layer in openlayer2 var options = { maxExtent: new OpenLayers.Bounds(...
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0answers
58 views

Size of an object in raster image based on DPI resolution and number of pixels

I'm trying to estimate the size of an object in a raster image, with known DPI resolution. To evaluate the validity of this method, I do as follows: 1) I'm drawing a 0,02 in × 0,02 in black square ...
2
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1answer
31 views

Spatial resolution for Bioclim datasets

I am new in using Bioclim datasets. I want to model future spread of Prosopis juliflora using landsat 30m. I want to add other datasets like temperature, ppt, elevation, soil moisture, pH, etc. Any ...
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1answer
37 views

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

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
80 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 (30m/...
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2answers
46 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
41 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
114 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 ...
4
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3answers
186 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
49 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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49 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
34 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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0answers
89 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
43 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
44 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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0answers
56 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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99 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
40 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 ...
3
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2answers
128 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
285 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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75 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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0answers
95 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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33 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
242 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
105 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 size....
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1answer
73 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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0answers
103 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 ...
2
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2answers
636 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
364 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 "ol.layer.Tile"...
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2answers
142 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
548 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
247 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
350 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 ...
4
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2answers
203 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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0answers
55 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
340 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
91 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
42 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 /...