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

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0
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0answers
14 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
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2answers
74 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
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0answers
23 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
17 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
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1answer
59 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
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0answers
19 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
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1answer
27 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
49 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
103 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
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0answers
36 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
9 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 ...
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0answers
13 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
144 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
86 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
21 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
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0answers
39 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
24 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
55 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
61 views

Setting Scale Dependent Visibility for WMS in PyQGIS

This code imports 'MiniScale' mapping from my WMS miniScale = ...
3
votes
3answers
42 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
23 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
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1answer
290 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
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0answers
44 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
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1answer
46 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
60 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
103 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
200 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
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0answers
63 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
92 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
78 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
36 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
110 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
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0answers
135 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
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0answers
55 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
125 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
39 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
119 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
138 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
130 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
77 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
19 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
163 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
166 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 ...
1
vote
0answers
72 views

Annotation/Label size adjusting to map scale in QGIS

I'm trying to label the street names for a map I'm working on but I do not want the labels to automatically adjust to the map scale when zooming in or out. My question is: In QGIS how do I set a fixed ...
1
vote
1answer
642 views

Printing map to scale

How to print this map (page) to 1:500 without georeferencing or without using any gis software. It is better to say that the marked line of 3 km should be 6 cm on paper (A4). See image:
1
vote
3answers
85 views

Scaling Items in the Legend [duplicate]

I am using ArcGIS 10.1. I inserted a legend however the items in the legend are too large because of the size i set them in the data view. How do i scale the items in the legend so they will be the ...
2
votes
0answers
36 views

Scale on map requires correction coefficient. But why? [duplicate]

I am computing the distance of a map I am getting from ArcGIS' REST services by using a calculator as provided by this answer. In a nutshell, it uses a GeodeticCalculator for distance computation ...
1
vote
1answer
100 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
59 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
2k 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 ...