Measurement is finding a number that shows the size or amount of something.

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4
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2answers
44 views

Need to merge overlapping line segments

I'm working with fish distribution data, and have combined several 24k habitat maps into a single layer that I'll call "critical habitat" In merging multiple distributions into one dataset, there are ...
2
votes
1answer
59 views

ArcMap lagging when I use the measure tool

ArcMap is lagging when I click the measure tool, my data isn't particularly big (biggest .shp is ~150mb) and my PC is brand new. Any idea what may be causing this?
3
votes
1answer
48 views

Analyzing spatial differences: conceptual and technical questions

My question is both conceptual and technical, but more conceptual than technical. It's a little long and multi-pronged, but I figured the best answers would consider everything, so thanks for bearing ...
2
votes
1answer
94 views

What do different realizations of the same datum have in common?

Firstly, am I correct in assuming that the process of determining the shape and the size of the spheroid is independent from the process of determining the origin and the orientation? For example, ...
0
votes
0answers
205 views

Get XY coordinates in UTM from web-mercator where UTM zone is not known

How to get XY(northing/easting) coordinates in UTM where data is WGS_1984_Web_Mercator_Auxiliary_Sphere(WKID: 3857) coordinate system and UTM zone is unknown. For e.g. India falls under multiple UTM ...
1
vote
1answer
54 views

Openlayers Measure Line and Area at the same time from the same button

I have been using separate buttons to measure lines and areas in my Openlayers maps (as per the Openlayers examples) but would ideally like to get the output for both length and area at the same time. ...
1
vote
0answers
21 views

How to hide infoWindow while using measure tool and showing it back after using it ArcGis JavaScript API [duplicate]

I have an infoWinfow set on the click event of the map. I want to disable this event when I'm using the measurement tool and then enable it back after the measurement tool is used. So far I've done ...
1
vote
1answer
92 views

Adding new vector layer. Should .shp file only be added or .shp plus corresponding .shx, .dbf, etc.?

I am a very definite QGIS newbie. I have been creating a map using files that had been used in ArcGis. Each time I wanted to add a new vector layer I opened an .shp file and specified CRS as WGS 84. ...
1
vote
1answer
265 views

Measuring Distance from Point to Point Along a Path in ArcMap

I am looking at a village and want to find the distance from each house (point) to the pagoda (point). However, I want the distance to be measured along a path (which I digitized as a polyline) and ...
0
votes
0answers
47 views

Uploading transmission line shapefile into spatialite.

I merged around 70 different transmission lines shapefiles of a state into one. Then, with a grid I divided the state into many features and got the centroids in QGIS. I'm trying to calculate in ...
2
votes
1answer
131 views

Is there any way to find the shortest distance from a point to a line?

I´m working with QGIS 1.8.0. I have a map divided into many features (thousands of small rectangles) and I have a point at the center of each of those features. I also have a map of the transmission ...
0
votes
1answer
59 views

How to know the real size of grid? [duplicate]

Im working with QGIS. When dividing a map with a grid I set in the paramters X=0.1 and Y=0.1. Could someone please explain what does that mean? I mean would the map be divided into 100mx100m squares? ...
1
vote
0answers
75 views

Can QGIS Measure Line tool compute correct geodetic distance?

As I understood, this tool normally shows distance in the project CRS units, not the geodetic meters (despite it actually says the distance is in meters). However, now I read (Section III, 4 - ...
0
votes
2answers
98 views

Calculating distance to a feature from a reference line

I have multiple shapefiles, each containing a coastline for a specific year. I want to calculate the perpendicular distance to the shoreline from a fixed vertical reference line. Please recommend me ...
0
votes
1answer
116 views

Measure length within a grid

I have a grid and some lines within a grid and I was wondering how to measure the length of the lines inside the grid. I can use the measure tool for a straight line, however in the future I will not ...
8
votes
3answers
477 views

Distance measurements across UTM zones: use geographic or planar approaches?

I have a survey grid spread across 3 UTM zones (36N, 36S, 37S). I want to find the nearest (or shortest) distances of the centroids of these grids to roads and various points between. It seems like ...
0
votes
0answers
142 views

OpenLayers Vector Line Feature hard to select

I have a measurement control on an OpenLayers map which allows the user to (unsurprisingly) measure lines and areas on the map. They draw the line/area they want, OpenLayers does the measurements ...
1
vote
0answers
67 views

Projection for Tracking a Vehicle

I'm looking for the best coordinate system projection to use for cartesian calculations while a vehicle is running from its starting location to about 100 miles from that spot. The offline format ...
0
votes
1answer
95 views

QGis different results between $length and measureing in the map

I use QGIS Lisboa and need the lenght of some shapefiles. When I use the field calculator the results are always around 30 % higher than in real, also than a measuring in the map. Does anybody have a ...
2
votes
1answer
357 views

Can the units of the measure tool in QGIS be changed?

All, I'm trying to do some error-checking with some rasters I'm creating, and want to measure line distances on the map in feet, rather than meters - which is what the measure line tool seems to be ...
1
vote
1answer
297 views

Find closest point from origin in QGIS and display measure line in composer

I have a location point. there are several constraints areas surrounding the point. Is there a way to calculate the closest point of this constraint from my point and to display the distances as a ...
2
votes
2answers
118 views

How do I calculate acreage grouped by owner, masked by a poly?

I have statewide land ownership data and have created a mask to project ownership for only one county. I need to calculate the acreage of each owner within that county. Is there a quick way to ...
3
votes
0answers
61 views

Detect connections along shapefile in QGIS?

I have a set of polylines and a set of points that lie along or very near to the polylines, and I need a way to measure which points are connected to each other along the polylines, and what the ...
5
votes
1answer
2k views

OpenLayers measure tool - instant measurement

I need to use measure tool to measure distances (instant measurement!) in my application. Instant measurement example can be found here. But the main problem is that when I use instant measurement ...
4
votes
1answer
125 views

Measurement not correct in QGIS 1.8

I have a SHP file of sub-areas of U.S. counties (roughly about the size of a Census tract) that I've reprojected into a 'true distance' projection (World Equidistant Cylindrical) in QGIS 1.8. However, ...
3
votes
1answer
757 views

Measurements in QGIS 1.8.0

I am using qgis version 1.8.0. My project contains tiff and several "shape" layers. The CRS is WGS 84 (EPSG:4326). I am attempting to measure the areas of the layer polygons. However if I click on the ...
4
votes
4answers
225 views

How to measure without coordinates?

My current Project is to "map" a turntable in qgis. I know, very unlikely but that's what my teacher wants. My teacher also wants me to measure something in this project (Very specific, isn't it?). ...
2
votes
1answer
418 views

How to meassure the length of common edges between polygons?

I have a shapefile that contains several polygons which in fact represent the limits of several counties. My task is to find each length of each shared border. So in other words I want to know how ...
2
votes
1answer
301 views

Does anyone know how to get the QGIS Web Client measure tool to show units in feet and miles?

Does anyone know how to change the QGIS Web Client measure tool (distance and area) so that it shows feet or miles rather than meters?
5
votes
1answer
171 views

Literature on public transit network connectivity metrics

Are you aware of any literature or best practices for measuring the connectivity of a public transit network, taking both route geometry and the schedule into account? In other words, I'd like to ...
4
votes
1answer
223 views

Closing MeasureTool Window

I'm activating the built in ArcGIS measure tool using the following code: ControlsMapMeasureTool measureTool = new ControlsMapMeasureToolClass(); measureTool.OnCreate(_axMapControl.Object); // set ...
6
votes
2answers
2k views

Measuring distance between points in ArcMap - what coordinate system to use?

This is a basic -newbie - question. I have some handwritten data points taken off a GPS - so I am assuming they are in WGS 84, and I want to load them in ArcMap 9.3, via excel, and measure the ...
5
votes
1answer
2k views

Is it possible to display the length of each segment with the Openlayers measure control?

I am trying to make a OpenLayers measure tool that displays the length of each segment on top of each segment and the total length of the measurement as shown below: I have used this example ...
3
votes
2answers
695 views

Measure the Length of a Line on a Map after a MOUSE_MOVE Event

One of the actions a user can perform using the ESRI Flex Viewer application is to draw a shape on a map (e.g. a line). Once the user is finished drawing the line, they will double-click the mouse ...
5
votes
1answer
299 views

Geometry Calculation

Wanted to ask about accuracy of areas calculated by GIS compared to actual ones on ground. Because I have data of my country without areas for the districts within Uganda. Are the areas obtained using ...
3
votes
2answers
5k views

Cannot get areas for polygon layers in ArcMap 10

For an ArcGIS project opened in ArcMap 10, we have added polygon layers representing different geographical features. After all the polygons were created, we opened the attribute tables for those ...
6
votes
1answer
564 views

Is it impossible to measure Right of Way in ArcGIS?

I'm helping bring CAD people into ArcGIS so that everyone throughout the company is on the same page and there is one database for everything. Right now, one of the biggest hurdles is making sure all ...
3
votes
0answers
124 views

Where does “Update measurements” put its updated measurements? (MeemsTools)

I have several .shp files loaded into MapWindows GIS. I go to plug-ins > Meems Tools and click on "UpdateMeasurement Plugin", and it loads. I click on the Update measurements, and in the the Update ...
2
votes
3answers
1k views

Distance between a line layer and several other line features (arcGIS 9.3 Arcview Licence)

I have a "Drain" line layer (with 150 lines) that I need to calculate the distance from lines to all objects within 120m. I've tried doing a spatial join and its great but I need more than just the ...
12
votes
2answers
3k views

Using Geodesic Measurements for Circle Radii?

I am currently developing an OpenLayers mapping site. Measurements can be made using a line tool, and an area tool. Both of these are currently set to calculate geodesic measurements as outlined in ...