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

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1
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1answer
18 views

Checking layers with scale based visibility for visibility in QGIS

I am writing a Python method which I want the mouse click event to connect to. The method selects objects from layers that satisfy certain conditions. I want to select from any visible layer, that has ...
0
votes
0answers
12 views

Drawing Google Map & printing at 1:160 (N Scale for modeling)?

I would like to draw a Google Map between two cities crossing a mountain pass in the Western USA. That part I can do just fine. What I would then like to do is print it at the scale (am I using that ...
1
vote
0answers
9 views

Loading Shapefile with Work Network creating Negative Scale

For the company I work for, we have our own servers and network we load upon start up to do our work within QGIS. However its about 50/50 when loading an outside shapefile that it works. When I load ...
1
vote
2answers
18 views

Can TextSymbolizer font size be set as a function of the scale?

The standard behaviour when rendering WMS layers is to keep the text size across all scales and then filter out colliding labels so that the text remains readable, although delivering incomplete ...
0
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1answer
36 views

Creating polygon grid using fixed extent

I have a Shapefile of a town. I would like to divide the whole area into grids such that each grid has a scale of 1:2000. I have set my map to fixed scale (1:2000) in Layout View.
0
votes
1answer
45 views

Divide into grid and Mosaic using google earth?

Is it possible to download 1:2000 scale of a town using google earth image? If divide the whole area into grid and mosaic them is an option, how it is done using google earth? I tried using grid. But ...
3
votes
0answers
44 views

Printing a 1" scale from 2.8.2 Print Composer

I'm working on a small-scale site survey in qGIS, and for engineering purposes I need to print physical copies of the map that can be used with an engineering ruler. Basically, I need a way to print ...
0
votes
1answer
24 views

NHD layers won't redraw in ArcGIS 10.1 at small scale?

If I am already zoomed in to a smaller scale and then add the NHD Hydrography dataset (already clipped to just Texas), I can see all the NHDFlowlines, NHDAreas, and other layers that come in the ...
2
votes
2answers
87 views

When does a local system introduce errors in a map due to the earth's curvature?

If the extent of a map is very small, like a building plan, there is no coordinate reference system used. To which scale/size of building is that acceptable? Of course it depends on the precision ...
0
votes
0answers
30 views

Leaflet control to display scale in native/declared CRS (i.e. degrees)

I'd like to have a Leaflet map display the scale of a layer in native coordinates (i.e. degrees in EPSG:4326). From what I have read so far the map control always handles meters; is there a way to ...
1
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0answers
18 views

Creating Concentric circles using the ggmap function from GGMAP package R [duplicate]

I would like to create two concentric circles using the ggmap package and ggmap function, one being 1/4 mile and the other 1 mile radius around the 16 metro rail stations in Los Angeles California. It ...
0
votes
1answer
67 views

Area and distance calculation/measurement unexpected after projecting? [duplicate]

I have converted a GIS shapefile of Botswana from the geographic coordinate system GCS_WGS_1984 to the projected coordinate system Africa_Albers_Equal_Area_Conic to be able to calculate the area of ...
0
votes
0answers
24 views

Rules for scale specific layer style in GeoServer

I've got a very large polygon land cover map (millions of polygons) over a large area. Our first try at serving the data through GeoServer WMS was not very successful due to the large amount of small ...
1
vote
1answer
33 views

Is it possible to display irregular values in the scale bar in QGIS 2.8?

Is it possible to display irregular - increasing values in scale bar in print composer? For example: 5, 20, 100, 250.
3
votes
1answer
79 views

Set scale dependant labels arcmap 10.3

I am wondering if it is possible to create scaled labels so that at a certain zoom level only one label appears but when you zoom in closer more labels appear for different fields. I have this ...
1
vote
2answers
109 views

Since upgrading to ArcGIS 10, my application doesn't rescale the map when the window is resized

I am upgrading a .NET application from ArcGIS 9.3 to ArcGIS 10.3. I've noticed that the map control behaves differently: the map no longer automatically rescales itself when the window is resized. To ...
1
vote
0answers
38 views

Set Layer Scale Range Still Draws When Layer is Grayed Out In TOC? ArcGIS 10.2

I have a layer which I have set the visible 'Scale Range' to don't show layer when zoomed out beyond: 1:18,489,298 and in beyond 1:9,244,6249. (I am using ArcgGIS Online/Bing Maps/Google Maps ...
1
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0answers
11 views

Adding active content to the Atlas in composer $scale

I have an Atlas of 178 pages that centers on different size villages, its all well organised through the composer and all works well. However, I can't use the scale bar as the differences between ...
0
votes
0answers
14 views

how to set default scale for ecw in geoserver stores?

I added an ECW that it's default scale is 1:1,000,000 to stores of geoserver, and then went to Layer preview panel and clicked on the link to see the preview of map. But when the preview appears in ...
2
votes
2answers
191 views

Calculate scale of a raster

A raster has a cell size of 200 meters. What is the corresponding scale of the raster? New to GIS, using ESRI, semester is almost over but this one question is confusing. I didn't think you could ...
2
votes
0answers
105 views

Different scale of basemap after exporting to PDF/Image

After creating and exporting my map to pdf/tif obviously there are different scales of the basemap in the exported file compared to the map I created in the printcomposer. See pictures... I am using ...
0
votes
0answers
24 views

Disabling Extent Based Rendering using ESRI Javascript API

I am using ESRI's javascript API to generate a heatmap renderer for my feature layer. I am noticing that the heatmap calculation/visualization is dependent upon what is in the current zoom extent. For ...
0
votes
0answers
48 views

How to convert map scale 1:10000 to nearest zoom level 16 scale 1:9028

I am making tile map service port for this map http://mapserver.geology.sk/sbd/. When you max zoom this map, you will get scale 1:10000. Tile size is 256px. You can check it here ...
1
vote
1answer
30 views

How to change rule-based Layer Styles all at once in QGIS?

Let's say I have a layer with buildings which is only shown when the scale is higher than 1:10000. When the scale is higher than 5000, I want them to show its function color (retail, residential, ...) ...
2
votes
1answer
77 views

How to calculate scale

I'm working on processing some geo-spatial raster data, JOG-A raster to be exact, and know the imagery is supposed to be to a scale of 1:250000. However I would like to calculate this in code but am ...
1
vote
1answer
72 views

Setting Scale Dependent Visibility for WMS in PyQGIS

This code imports 'MiniScale' mapping from my WMS miniScale = ...
3
votes
3answers
50 views

Layer Extent NOT Set When Bringing In ArcGIS Server map service?

I published a mapping service on ArcGIS Server 10.3, set the layer to 'Don't show layer when zoomed' 'in beyond' to 1:577,791, prior to publishing. When I bring in the mapping service into ArcMap, ...
2
votes
0answers
24 views

Creating a distance overlay that is computed by the distance of points/lines and recalculated on zooming

I created a fictional map and visualized it with d3. Now I would like to show a scale/rule so that the user can see which distance (kilometers,meters) he is currently using. I was thinking about ...
1
vote
1answer
337 views

Relationship between scale, ppi, and map resolution

Wanting to know the screen resolution (pixels per inch) of my device, I displayed my map resolution and scale using this openlayers code: console.log("resolution: " + map.getResolution()); ...
0
votes
0answers
53 views

Arcgis v10.2.4 ios and android sdk shows wrong cache data

I hava tiledmap and it's scale is 500.000 and when i tried to show on android or ios devices. It on mapview it brings me cached data of scale 300.000 but when i tried to show it on web page , it works ...
1
vote
1answer
50 views

Disconnected Satellite map tiles usable with OpenLayers or other javascript api

I'm looking for satellite map, usable with OpenLayer (or with an other js api), with a good scale (at least 100m, MapQuest stops at 1000m) and avaible for a disconnected mode (avaible for download). ...
2
votes
2answers
87 views

QGIS Composer wrong scale

I'm creating maps with a specified scale for the map window in QGIS Composer. Project CRS is WGS84, layers are WGS84, onthefly-transformation enabled. The area is approx. 1° x 1° (100 x 100 km). But ...
0
votes
0answers
112 views

problem with show highway labels in certaint zoom level with mapsforge map

I'm using a mapsforge map ( .map format) in my projet .I converted the OSM file to mapsforge file and i use it. I want to show highway labels from zoom 13 to zoom 20 .I'm using vetorial map viewer. ...
2
votes
3answers
232 views

Moving (translating and scaling) a polygon in a shapefile

Updated Question: I have an ESRI shapfile of the US, with Alaska, Hawaii, etc, broken down by county. I'm extracting the polygons (each representing a county) from the shp file, and then displaying ...
1
vote
0answers
70 views

Small discrepancy in scale reported by OpenLayers and GeoServer (after DPI fix)

I'm implementing some scale-dependent functionality in an application that uses OpenLayers 2.12 on the client and GeoServer 2.6.1 on the server. The legend is created in JavaScript and when a ...
1
vote
1answer
119 views

How to show\hide symbols according scales

How to show\hide symbols according scales, I couldn’t figure out if there is a way to hide symbols depending on scales the same way we do with labels. For example, in the screenshots below, the ...
1
vote
1answer
105 views

CartoDB - How do I turn on a scale (in feet / imperial) in the Visualization?

I'm making a map for an architectural site analysis and need to have a scale for the Visualization. Is this a feature in CartoDB? Thanks!
3
votes
1answer
47 views

Equatorial Scale

I have seen Equatorial Scale written along with the RF on the World Map in many Atlases, for eg., "Equatorial Scale 1:95 000 000". What does this Equatorial Scale mean and what is the significance of ...
1
vote
1answer
126 views

How to deactivate zoom on the mouse wheel?

I need to fixed scale in canvas in QGIS but I didn't find this function. If I fix scale it is impossible to make zoom in or zoom out into canvas. Only one move which layers loaded can be do are ...
1
vote
0answers
164 views

How to get bounds coords by center LatLng point, width and height in pixels and zoom?

I have to calculate bounds coordinates to query mongodb box on server side to get data before google maps is loaded. How can I get four LatLng corners by center LatLng point, window width and height ...
1
vote
0answers
64 views

QGIS symbols using “advanced — size scale field” aborts rendering if encounters negative [closed]

Not sure if this is new in QGIS 2.6 Brighton, but I was struggling to get my points (small area centroids) to properly scale in size based on attribute values (population growth). Only a few dots ...
1
vote
2answers
153 views

Worldwide High-Resolution Water Body Shapefiles with Consistent Scale

Where from your website can I access worldwide vector water body shapefiles that have better resolution than the generic SRTM 90m data? Do you have coastlines and inland features (lakes, estuaries, ...
2
votes
0answers
40 views

How can I manipulate the number of points visible according to scale?

I've gotten trillions of points extracted from a DEM and they are to be labelled. It's fine at scales such as 1:500 but it gets too cluttered especially if I need to make maps of this with scales up ...
1
vote
1answer
132 views

QGIS Web Client zoom and scale

I have a problem with setting up zoom levels and max/min scale in QGIS web client. It looks like that values used in GlobalOptions.js file does not apply. Right now ZOOM_LEVELS is 70, maxScale 50 and ...
1
vote
2answers
148 views

Measuring tool shows different measurements for same building in two different map documents?

So I have two map documents with two different Coordinate Systems set for the layers but using copies of the same shapefile. Map 1: Coordinate System: ...
1
vote
0answers
152 views

ArcGIS SDK for .Net (used in WPF): update map's zoom parameters after changing base layer

I'm having the following issue: Suppose I have a Map object and 2 base layers (a world map and a street map). A world map doesn't let us view the map too closely. The street map allows us to view as ...
1
vote
1answer
88 views

Dynamic scale dependency from attribute query using ArcGIS for Desktop?

If I have a feature class called roads with an attribute for type e.g. highway etc. Is there a way to setup a dynamic scale dependency on the layer based on the type of road? Like do a SQL query ...
1
vote
0answers
20 views

Restrict the scale of the search widget in ArcGIS Flex API

I wonder if I could restrict the scale scope only for the searching widget (and not the extent of the map)? We want to narrow down the scale for searching in order to avoid too many results which may ...
9
votes
0answers
164 views

How do ESRI and QGIS calculate scale values of geographic projections? [closed]

Does anyone know how (from which location) scale values are calculated in ESRI products and QGIS for geographic projections? The only thing I've noticed is that QGIS is changing scales when you pan ...
4
votes
2answers
189 views

The scale in Qgis is not setting to feet

I am working in QGIS 2.4. I have changed the CRS of all the layers and in the project properties to EPSG:102739 - NAD_1983_StatePlane_Texas_Central_FIPS_4203_Feet. I am in print composer trying to ...