San Vicente map MapGazer – Using map tools

Introduction

Download MapGazer


Getting started

Using marks:
   Waypoints
   Tracks
   Routes
   Areas
   Mark properties

Using the Scale

Using icons

Using transparency


General settings

Getting maps

Using map tools

Elevation data

Coordinate formats

GPX files

Command line

Thanks

Every map has one or more zoom levels, or layers, which can present a view of the map at a different scale. Zoom level 0 is the least detailed (it can show almost the entire globe as one small image) whereas (for example) 1:25,000 topographical maps are typically presented at zoom level 15 or 16. The scale at a given zoom level differs from the one above or below it by a factor of two.

MapGazer lets you copy layers from maps (for example, from maps with different sources or with few layers) to make new composite maps. There are two kinds of copying available:

  • Simple copy – a layer is copied in its entirety to a new (different) map.

    To do this, zoom to the required level in the source map, then select Map tools → Copy current map layer from the Map menu (or from the pop-up menu shown when you right-click on the map). You will then be prompted to select the target map (use New Folder to create a new map).

    The copy takes place in the background and a progress box showing the progress of the copy will be shown, although the copy should normally be quite fast as only direct copying of files takes place.

  • Compressed copy – a layer is copied in its entirety to a new (different) map at the next layer out (that is, at zoom level less one). The map tiles from the source layer are compressed by a factor of two in each dimension to maintain the correct scale. Creating a layer by compressing a more detailed one can be useful when only a few source layers are available, or if a layer has been poorly compressed at source.

    To compress a layer, zoom to the required level in the source map, then select Map tools → Compress current map layer from the Map menu (or from the pop-up menu shown when you right-click on the map). You will then be prompted to select the target map (use New Folder to create a new map).

    The compression and copy takes place in the background and a progress box showing the progress of the copy will be shown.

    Compression can take some time for large map layers as new tiles are being created (one for each four tiles in the source map). When choosing which layers to compress and which to simply copy, it can be helpful to first experiment with a small subset map (see Using areas) – for example, by making compressed versions of all layers in a map as a new map then comparing the maps at the various zoom levels by either opening two view windows or overlaying one map on the other.

MapGazer and these web pages were written by Mike Cowlishaw; Please send me any corrections, suggestions, etc.
All content © Mike Cowlishaw, 2014–2017, except where marked otherwise. All rights reserved. The pages here, and the MapGazer program, are for non-commercial use only. Privacy policy: the Speleotrove website records no personal information and sets no ‘cookies’. However, statistics, etc. might be recorded by the web hosting service.

This page was last updated on 2017-05-01 by mfc.