Qgis Map Units

[Tiffany Crutch]

Iam a newbie, I think I'm pretty resourceful, but I cannot figure out, or find out by searches, just what "map units" are in QGIS as compared to "decimal degrees". For example I can only navigate by entering coordinates in the status bar with "map units" - decimal degrees do not seem to work? I assume I am missing something? And is there a tool to convert "decimal coordinates" into "map units?"

Warn when opening a project file saved with an olderversion of QGIS. You can always open projects created with older version ofQGIS but once the project is saved, trying to open with older release may failbecause of features not available in that version.

Add or Remove Documentation Path(s) to use for QGIS help. By default,a link to the official online User Manual corresponding to the version being usedis added. You can however add other links and prioritize them from top to bottom:each time you click on a Help button in a dialog, the topmost linkis checked and if no corresponding page is found, the next one is tried,and so on.

Documentation is versioned and translated only for QGIS Long Term Releases (LTR),meaning that if you are running a regular release (eg, QGIS 3.0), the help buttonwill by default open the next LTR manual page (ie. 3.4 LTR), which may containdescription of features in newer releases (3.2 and 3.4). If no LTR documentationis available then the testing doc, with features from newer and developmentversions, is used.

Check Use custom variables (restart required - include separators)and you can Add and Remove environmentvariables.For each new item, you can configure a Variable name, its Valueand the Apply method to use, among which:

Only show CRS accuracy warnings for inaccuracies which exceed a givendistance: occurs when you are explicitly creating or modifying a dataset andselect a CRS based on a datum ensemble with loweraccuracy. The default is to Always show the warning if any inaccuracy.Requires a QGIS version using at least PROJ 8.0.

Show CRS accuracy warning for layers in project legend:If checked, any layer with a CRS with accuracy issues (i.e. a dynamic crs withno coordinate epoch available, or a CRS based on a datum ensemble with inherent inaccuracyexceeding the user-set limit) will have the warning iconin the Layers panel reflecting that it is a low-accuracy layer.

Attribute table row cache . This row cache makesit possible to save the last loaded N attribute rows so that working with theattribute table will be quicker. The cache will be deleted when closing theattribute table.

When working with layers with big amount of records, opening the attribute tablemay be slow as the dialog request all the rows in the layer. Setting theAttribute table behavior to Show features visible on map willmake QGIS request only the features in the current map canvas when opening thetable, allowing a quick data loading.

Note that data in this attribute table instance will be always tied to the canvasextent it was opened with, meaning that selecting Show All Features withinsuch a table will not display new features. You can however update the set ofdisplayed features by changing the canvas extent and selecting Show FeaturesVisible On Map option in the attribute table.

Automatically refresh directories in browser dock whentheir contents change: Allows you to manually opt-out of monitoring directoriesin the Browser panel by default (eg, to avoid potential slow downdue to network latency).

It is possible to use localized paths for any kind of file based data source.They are a list of paths which are used to abstract the data source location.For instance, if C:\my_maps is listed in the localized paths,a layer having C:\my_maps\my_country\ortho.tif as data sourcewill be saved in the project using localized:my_country\ortho.tif.

GDAL is a data exchange library for geospatial data that supports alarge number of vector and raster formats.It provides drivers to read and (often) write data in these formats.The GDAL tab exposes the drivers for raster and vectorformats with their capabilities.

The upper part of the dialog lists the current profile(s) and allows you toadd new ones or remove any of them. You can also reset the profile to itsdefault parameters if you have changed them. Some drivers (eg, GeoTiff)have some sample of profiles you can work with.

By default new layers added to the map should bedisplayed: unchecking this option can be handy when loading multiple layersto avoid each new layer being rendered in the canvas and slow down the process

The map canvas renders in the background onto a separate image and at eachMap update interval (defaults to 250 ms), the content from this(off-screen) image will be taken to update the visible screen representation.However, if rendering finishes faster than this duration, it will be showninstantaneously.

Segmentation tolerance: this setting controls the way circular arcsare rendered. The smaller maximum angle (between the two consecutive verticesand the curve center, in degrees) or maximum difference (distance between thesegment of the two vertices and the curve line, in map units), the morestraight line segments will be used during rendering.

Early resampling: allows to calculate the rasterrendering at the provider level where the resolution of the source is known,and ensures a better zoom in rendering with QGIS custom styling.Really convenient for tile rasters loaded using an interpretation method.The option can also be set at the layer level (Symbology properties)

Show feature count for newly added layers:displays in the Layers panel the number of features next to the layer name.Feature count of classes, if any, is as well displayed.You can right-click on a layer to turn on/off its feature count.

For best experience, it is recommended to enable Respect screen DPI,especially when using multiple or different monitors and preparing visually high-quality maps.Disabling Respect screen DPI will generate output thatmay be more suitable for mapping intended for on-screen use only, especiallywhere font sizes should match other applications.

Rendering in layouts is not affected by the Respect screen DPIsetting; it always respects the specified DPI for the target output device.Also note that this setting uses the physical screen DPI asreported by the operating system, which may not be accurate for all displays.

Reuse last entered attribute values: remember the lastused value of every attribute and use it as default for the next feature being digitized.Works per layer. This behavior can also be controled on a per-field basis(see Configure the field behavior).

Validate geometries. Editing complex lines and polygons with manynodes can result in very slow rendering. This is because the defaultvalidation procedures in QGIS can take a lot of time. To speed up rendering, itis possible to select GEOS geometry validation (starting from GEOS 3.3) or toswitch it off. GEOS geometry validation is much faster, but the disadvantageis that only the first geometry problem will be reported.

The next 3 options refer to the Offset Curve tool inAdvanced digitizing. Through the various settings, it is possible toinfluence the shape of the line offset. These options are possible startingfrom GEOS 3.3.

In Elevation menu, you can set a specific colorto use as the Background color for elevation profiles.This can make the chart more readable for certain datasets, e.g. point clouds with RGB coloring,where the default background color is too similar to point colors to be easily discernable.If unchanged, the elevation profiles will continue to display using the standard system background color.

Under Graphics memory, the Allowed memory per layer optionlets you set the GPU memory limit configuration on each layer.This is useful for users utilizing large 3D scenes which exhaust the available GPU memory resources.When a limit is hit, a warning is also displayed, which should assist in troubleshooting large scenes.

By default, Recent colors, Standard colors andProject colors palettes can not be removed and are set to appear inthe color button drop-down. Custom palettes can also be added to this widgetthanks to the Show in Color Buttons option.

User Fonts: Allows you to place TTF or OTF fonts in the fonts sub-folder of the user profile.These fonts can be automatically loaded at QGIS startup time.This provides a way to use fonts without requiring them to be installed on an operating system level,which is often blocked in enterprise environments.The panel lists all installed user fonts and allows you to manage (i.e. remove) previously installed user fonts.

It also allows the user to manage global-level variables. Click the button to add a new custom global-level variable. Likewise, select a customglobal-level variable from the list and click the button to removeit.

set whether to Calculate Bearings from travel direction:If checked, the bearing reported by the GPS device will be ignoredand the bearing will instead be calculated by the angle between the previous two GPS locations.

GPSBabel converts waypoints, tracks, and routes between popular GPS receiverssuch as Garmin or Magellan and mapping programs like Google Earth or Basecamp.Literally hundreds of GPS receivers and programs are supported.QGIS relies on GPSBabel to interact with these devicesand manipulate their data.

The Locator tab lets you configure the Locator bar, a quick search widget available on the status bar to helpyou perform searches in the application.It provides some default filters (with prefix) to use:

Features in All Layers (af): searches for matching attributes in thedisplay name of each searchable layersand zooms to the selected feature.Press to configure the maximum number of results and the maximumnumber of results per layer.

select a Color scheme: predefined settings are Default,Solarized Dark and Solarized Light. A Custom scheme is triggeredas soon as you modify a color and can be reset with selecting a predefinedscheme.

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