The ratio between distances on a map and distances in the world

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1
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1answer
104 views

Shapefile not projecting correctly [duplicate]

I am still new to this, so I apologise if I don't make a lot of sense! I am using QGIS 2.4.0 Chugiak. I am working on a project set to the GDA94/MGA Zone 50 coordinate system with 'on the fly ...
1
vote
1answer
62 views

Calculate geographic size in meters given lower left coordinate and upper right coordinate

How do you find the geographic size in meters given a lower left coordinate and upper right coordinate. The projection would be WGS84 projection. Ex. 33,-119,35,-117. What would be the area in meters ...
2
votes
1answer
3k views

How to calculate pixels per meter ratio, according to Google or Bing map zoom level?

I have an image and detect two points in the image. I want to calculate the distance between these two points. I'm using Google map and Bing map. I have x,y pixel values for both two points zoom ...
2
votes
0answers
68 views

Choosing the map scale (1:nnn) for the given raster dimension

Starting points: let define the raster image size, say: 1800x900 pixels I want draw my own raster image map - by drawing polygons e.g. like "draw line from pixel with coordinates x100y100 to pixel ...
1
vote
1answer
106 views

Why are my points being flipped or mirrored when I convert from DMS to DD?

I have a collection of crash data that provides latitude and longitude in degrees, minutes, and seconds that I'm converting to decimal degrees using: (degrees + (minutes/60.0) + (seconds/3600.0)) ...
0
votes
0answers
56 views

Scale keeps changing in QGIS composer?

Every time I pan the map content in the QGIS composer window the scale changes. Is there a way to make it stick at specific scale?
0
votes
0answers
54 views

Enlarge region/features in shape file

I'm completely new to QGIS. I have a shape file over the counties in Denmark (see here for what the shape file looks like). The counties around Copenhagen are rather small and I'd like to add an ...
0
votes
1answer
95 views

problem in scale of projected raster

I have a shapefile (my basin limit) and one raster file that I projected it to the shapefile coordinate system and set its cell size to 1000m(area=1Km2). my basin area is 5400 Km2 and it should ...
1
vote
1answer
121 views

Why is the scale on my maps a bit too big?

I saved couple of pdfs when I relized that the scale I set is not the scale that shows, everything is a bit bigger. I tried to check it not only at the print composer, but in the "work space" and it ...
1
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0answers
62 views

Web site for plan upload and measure

I've got plans of my house and a warehouse on paper. I would like to scan them in JPEG, import them on my PC and measure them. I'm looking for a website where I can upload those tiff, jpeg or pdf ...
0
votes
2answers
141 views

Defining a scale number from the Helmert transformation

I know this is more bit of a cartographic issue, but maybe somebody would be able to help. I have an old map georeferenced to the openstreetmap with 50 identical points. I want to get the scale of the ...
4
votes
2answers
545 views

Scale and Z factor have no effect on hillshade analysis in QGIS

I used an SRTM DEM to create a hillshade in QGIS 2.2.0. However, the resultant hillshade seems to be vertically exaggerated. Also, changing the settings for scale and z-factor does not have any effect ...
1
vote
0answers
216 views

qgis html annotation - scale dependent rendering?

In the QGIS 2.2 map composer, I have a large map at a certain scale (let's say 1:25000) and an inset map that is an enlargement of part of the main map (let's say 1:12500). When adding html ...
2
votes
0answers
158 views

Mapfish printing application from Openlayers : disableScaleLocking

Mapfish printing application from Openlayers: I get the following error when I use a different scale than the scales defined in the config.yaml even though I am using disableScaleLocking: true ...
2
votes
1answer
197 views

Why are map scales not used instead of Zoom-levels in web mapping clients such as OSM or Google Maps?

Google Maps and OpenstreetMap and many other web mapping products utilize the concept of zoom-levels to change the size of the map in a web client. Most people are however more familiar with the ...
2
votes
1answer
212 views

Maximum scale dependent visibility changes from 1:0 to -2147483648:1

QGIS 2.0.1 Dufour. When i open the layer properties and the scale dependent visibility is unchecked and when i check it, the maximum (inclusive) shows 1:0. I click Apply, OK, reopen layer properties ...
0
votes
2answers
421 views

How to set map scale using Arcgis silverlight Api?

I want to set map scale manualy using ArcGIS Silverlight Api . I use silverlight api 3 and arcgis server 10 . I have 4 scale levels and I want to show the map in these scales. How can i set these ...
1
vote
1answer
316 views

Map scale vs. map extent vs. map canvas size in Print Map Composer

Please help! I am so beyond frustrated. I am using QGIS 2.0 and when I try to create my map in the print composer, I cannot make the scale and the extent the way that I need it. I need my map to be ...
2
votes
1answer
228 views

How can I set a specific meter scale in the print map composer?

I am making a map for an orienteering class at the environmental education center that I work at. In order for us to easily calculate the distance between orienteering points, I need the scale to be ...
0
votes
0answers
48 views

How to get tiff file of project limits at specific scale using QGIS 2.0?

I have shapefile which has a layer extent scale of 1:551920. I want the TIF file exports of the file at a scale of 1:200000. Is there way to do it automatically? Or do I have to do it manually by ...
1
vote
1answer
398 views

How to add Map Legend, Scale Bar and Select tool to an ArcGIS Server Service?

I have published a service from ArcMap to my Server Account but I can't figure out how to add the legend, scale bar and select tool to the service. According to the published service it was built ...
0
votes
1answer
500 views

Error in raster displays of NoData cells when “zoomed in” past scale 1:3,000,000

I looked around GIS stack exchange and ArcGIS Help pages and didn't find anything on this issue. I have encountered an error in how Arc displays a Raster file (.TIF format) at different scales. At ...
1
vote
1answer
288 views

How to calculate size of a pixel for a scanned map?

A land use map has a scale of 1:150000. The map is scanned at a resolution of 150 DPI. What will be the surface area in m square represented by each pixel in the resulting easter map?
3
votes
3answers
94 views

How do I create a map that is not to scale in QGIS?

I want to make a map that isn't to scale and I'm so used to being pedantic about CRS and scale that I don't know where to start. The map that I need to make is a simple guide for people to get to a ...
4
votes
2answers
115 views

Measuring scale for small scale maps

A cartography question: you open an atlas and usually at the beginning of it there are some world maps showing various thematics. Let's say the world map uses Robinson projection and it says it has a ...
2
votes
1answer
42 views

references for the colloquial naming of spatial data resolution

In our era of data deluge, many folks, including myself, quest for ill-defined "high-resolution" datasets. I suspect that colloquial description of spatial resolution as "high" or "low" is and will ...
2
votes
3answers
419 views

How can I change map scale in ArcMap, after I'm almost finished digitizing? [closed]

I'm just about to design a map that represents different areas in my immediate living environment. I Unfortunately made a big mistake at the beginning of my project. The current scale is given by ...
0
votes
0answers
150 views

issue with QGIS Scale Level

I have different layers of shape files. I have imported all shape files into PostGIS. Now i want to show 3 layers Country, State & District with different scale/zoom level I tried to set scale ...
2
votes
1answer
1k views

ArcGIS giving measured distances and the scalebar incorrectly

I am currently using ArcGIS 10.1 and am struggling to be able to measure distance or set a scale bar correctly. Its currently giving me absurd results orders of magnitudes to small (0.5m etc). All my ...
0
votes
2answers
401 views

Is it possible to set a reference scale in QGIS?

It's a little tricky to pick label and feature styles (line thickness, colours, etc) in the map canvas because they don't reflect what I would see in my print composer which is at a different scale ...
1
vote
2answers
301 views

Rasters added to mosaic dataset only display at large acale

I have a set of 357 rasters in .jp2 that I've added to a mosaic dataset. All but 7 of them display properly, but the 7 only display at larger scales, around 1:6500 and under. I've tried adding them ...
6
votes
1answer
1k views

How to automatically generate useful scales for data driven pages in ArcGIS desktop

I have been tasked with creating several hundred maps of properties that intersect a long pipeline. The maps will zoom to the part of the property which shows the intersection. The lengths of ...
5
votes
3answers
209 views

How to know if shapefile is georeferenced?

I have a shapefile which is located in province in indonesia. it contains many sub-province if i removed sub regions inside a shapefile, and it leaves a small region, and my question is that small ...
1
vote
1answer
825 views

ArcMap Text Annotations Display in Proportion to Map Scale

My question is probably of an 'easy fix' however I've been struggling with it for a while! I'm trying to set up an annotation labels for several feature classess in a map and would like them to ...
1
vote
1answer
74 views

What does 8GK100K mean?

I have a lot of mosaic datasets: Zone8GK100k, Zone9GK100k, ... , Zone7GK25k, ... , Zone7Gk50K, ... , Zone7GK200K. As I know, 7GK, 8GK... are utm zone numbers. 1) What does 25K, 50k, 100k, 200k ...
1
vote
1answer
986 views

How to remove white parts in ArcMap 10.1?

This is the part of my map. On this picture you can see white strips. Some of this white parts are appeared on the intersection of 2 Mosaic Dataset (for eaxample, there is the real map in 1 Mosaic ...
0
votes
1answer
63 views

What is the scale and does it depend on the print out size?

I am new to ArcGIS and I would like to know what is the scale in ArcGIS and does it depend on the print out size or display? Can any one explain all about topic scale in the ArcGIS?
0
votes
0answers
115 views

how to set default scale value while loading map in QGIS?

I need to set scale value (x) for map loaded to qgis. This should be default so whenever i load map it should scale to x automatically. How to do this? Where should i insert code in QGIS source. I ...
3
votes
1answer
595 views

QGIS Shapefiles have the same CRS but dont line up. (Census Tiger Data & State Data)

I have the Census Tiger data for Oregon from http://www.census.gov/geo/maps-data/data/tiger-data.html Then the bottom one of 2010 Census Population & Housing Unit Counts — Blocks. The shp ...
2
votes
2answers
726 views

How do I know the vertical/horizontal units of my DEM? I'm creating a slope using gdaldem

I'm using gdaldem to create a slope map. I can apply a scale. The default is 1. The notes say: Ratio of vertical units to horizontal. If horizontal unit of source DEM is degrees (e.g WGS84 ...
0
votes
2answers
71 views

Scalar relationships ArcGIS

I have point data which has a number of fields/columns, each of which is at a different scale. I'm looking to find a way of constructing a very simple index which would combine this data. Say I have 3 ...
3
votes
2answers
1k views

Figuring out map scale when you know the spatial resolution of a Satellite Image?

I'm interested in figuring out how map scale and satellite pixel size (spatial resolution) are related. For example the TM or ETM+ has roughly 30m ground resolution, then, what could be the finest ...
1
vote
0answers
128 views

Set scale for labels

I have multiple shapefile with different geometry and I am trying to on a label of layers. For create a map I am using Geoserver and Openlayer. Requirement is layer are visible on a max zoom level ...
1
vote
2answers
1k views

How do I import OS raster tiles into QGIS at the correct scale?

I have some tiles of OS raster mapping and their associated TFW georeferencing files. The GR files are in the same folder as the raster data and have the same names, ie TQ21.tif/TQ21.tfw. In QGIS ...
3
votes
0answers
149 views

Use ArcPy to identify annotation reference scale?

I would like to retrieve the value of an annotation feature class reference scale using ArcPy (under ArcGIS 10.1). I cannot find where this property is stored (tried to access using the describe ...
0
votes
1answer
437 views

Adding a scale using SDK GXP OpenGeo Suite

Followed the tutorial using the OpenGeo suite SDK, and looking at adding a scale to my maps however the tutorial doesn't cover adding widgets only plugins. So I am not sure about how I would add ...
0
votes
1answer
110 views

Integer rasters referring to the same scale

I'm using ArcMap 10. I want to display the area of simulated avalanches. I want this area to be divided in different colors depending on the thickness of the deposit. I managed to do that. But I want ...
3
votes
1answer
321 views

Sensitivity analysis for coarse scale GIS epidemiological model?

I am working on an epidemiological model with disease incidence rate as dependent variable and environmental factors as independent variable. Disease data is available at county scale whereas ...
0
votes
0answers
20 views

Scale factor (constant not linear stretch) GDAL [duplicate]

I need to re-scale a geotiff with gdal. I'm aware that gdal_translate has a -scale function, but i need to actually apply a constant (eg value(x,y) * 100) instead of scale the pixels to within a ...
0
votes
1answer
140 views

Default Opengeo suite print module- scales given in selector differ when using the zoom slider

Using a default installation of the 3.0.2 suite, opening the Composer view(with the MapQuest OSM tiles as background) and clicking print (to pdf) to activate the print preview there appears to be a ...