Questions tagged [scale-factor]

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How do I accurately resize a map to match the scale of the next map I want to build a bigger map from?

I have exported a group of maps that I want to tile together in Illustrator. Since the maps are not of the same scale I tried calculating the factors between each scale to the largest number of map ...
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33 views

Formula for calculating the local point scale factor of a secant Mercator projection with Autochart

I am looking at a projected coordinate system with the following parameters: Datum WGS-84 Spheroid WGS-84 Semi-Major Axis (a) 6 378 137.000 m Inverse Flattening (1/f) 298.2572235634 Latitude of ...
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1answer
119 views

Statistic for measuring (local) autocorrelation of ordinal data

I have a spatial data set with a bunch of variables in nine-level ordinal scale. I want to calculate (local) spatial autocorrelation for each of these ordinal scale variables. I've been using ...
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1answer
80 views

Is having rectangular cell sizes in a raster bad (after resampling)?

I used rasterio to scale a raster I have to a new resolution. It was at (5.0, 5.0) resolution, and I wanted to make it (15.0, 15.0). However, the resulting resolution is not square anymore. Here's ...
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43 views

Scale data upon WCS request?

I am serving a set of GeoTiffs through GeoServer. In order to save disk space I have multiplied my original 32 bit floating point data by a factor 1000 and then rounded to the nearest integer, so I ...
3
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1answer
146 views

Relation between scale factor and standard meridians/parallels

Let's use transverse Mercator with a custom zone, with central meridian 30, the zone is 3 degrees wide at the equator, with a scale factor k=1, it means that the cylinder touching the spheroid along ...
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0answers
18 views

Using correct coordinate system in ArcMap? [duplicate]

Im doing fyp on sabah & saraawak map. it came without prj file. i manage projected it and its allign to each other. but now i think the map is too small. as in the whole continent is within few ...
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1answer
717 views

add scalefactor and offset to NetCDF

I am converting some NetCDF files from Float32 to either 16bit or 8bit to safe space on a server. Since I Originally created these NetCDF using GeoTIFF´s this is where I apply the conversion before ...
2
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1answer
84 views

How can I scale a feature referring to the area? [duplicate]

I'd like to scale features with a scale factor. With the scale tool of the editor toolbar it is possible to define a factor but then every single line of the feature is scaled by this factor. However, ...
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1answer
546 views

PostGis Scaling for Polygons at a fixed center location

I need to enlarge/expand a 2D polygon at its fixed location (lat,lon) with a constant scale factor in order to retrieve the surrounding area with the same shape as the origin polygon. What PostGIS ...
2
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1answer
261 views

Getting more details by zooming in web-client?

today I've setup a qgis server and web client on my windows machine. Here is my WebClient. Now I'd like to test out everything. I tried to zoom in to the map, but it just stops by 1:2257 . I need ...
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1answer
339 views

Standardizing layers in R?

I am using R to develop species distribution maps. Since I standardized my covariates during the modeling process, I needed to transform the country-wide data (i.e. riv) using the same values. I ...
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1answer
4k views

How do I get a specific scale/zoom level in the QGIS canvas?

I have a map project with CRS = NAD83 zone 13N. The canvas will zoom to 1:144,447, 1:288,295, 1:577,790, etc. The values in the dropdown, on the other hand are 1:100,000, 1:250,000, 1:500,000, etc. ...
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1answer
1k views

How to call Legend end points of multiple layers published from Geoserver?

I have map services published from ArcGIS server being called from Angular- Leaflet app and we are displaying the legend (controlled through map controls) from https://pxxxx.com/arcgis/rest/services/...
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1answer
616 views

QGIS 2.12.1 - Problem with Size Assistant in „data defined override“ Button - Error message

While trying out the Size Assistant feature I encountered a problem. I´m working with this csv Table: I tried to resize the Point Size based on the field „Anzahl Objk“ and to do this I went to „...
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615 views

reading raster without making QGIS apply the scale factor to the raster

Since QGIS multiplies the image with the scale factor when reading, it messes up the image if the scale factor is not properly defined to the data as QGIS expected. For example, I am reading MODIS ...
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1answer
170 views

LAStools (3D Analyst) scale factor application

I'm trying to use the las2las (transform) module from the LASTools toolset to apply a scale factor to an LAS dataset. The problem is that the client wants us to apply the scale factor from a known XY ...
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243 views

Query to merge simplified polygons according to the map scale-factor [closed]

I'm trying to construct a view in PostgreSQL that simplify polygons according to the map scale-factor. Basically I was reading this thread http://linfiniti.com/2011/06/scale-dependent-generalization-...
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190 views

DPI Dependent OSM Tile Rendering

We have built an OSM Tile Server following the instructions at http://switch2osm.org/serving-tiles/building-a-tile-server-from-packages/ The tile server is rendering tiles, but the street names on ...
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1answer
1k views

Using a Local Datum Plane (LDP) scale factor within ArcMap?

I have a CADD drawing that uses a Local Datum Plane (LDP) scale factor of 0.99991199. When I add the drawing to ArcMap without taking into account the scale factor, the drawing appears to the east of ...
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2answers
9k views

Influence of the scale factor on the projection

I'm currently reading documentation about map projections to understand the source code of the Proj4 project. The scale factor is named in a variety of sources I read. This sources explained its ...
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0answers
141 views

Scaling features based on an attribute [closed]

I would like to scale polygon features by a specific factor I have calculated for each feature in a feature class. I know of the Scale tool, however it only allows for manual entry of a scale factor ...
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2answers
2k views

Easy way to render TileMill tiles in retina mode with Leaflet?

I have a few quick little map websites that run straight off TileMill, without pre-exporting. They usually have code like this: L.tileLayer('http://example.com:20008/tile/MyMap/{z}/{x}/{y}.png', {})...
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1answer
2k views

My class using ogr to calculate distance is returning incorrect results away from the equator

In an answer to this question ustroetz kindly provided some sample code for use of ogr to do lat/lon distance and point in polygon calculations. I've created a Python class based on his example to do ...
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3answers
3k views

maxScale or minScale don't work in vector (from WFS) layer

var options = { projection: "EPSG:900913", displayProjection: "EPSG:4326", units: 'm' }; map = new OpenLayers.Map('map', options); ilceSinir = new OpenLayers....