[Qgis-user] Limit lines to orthogonal directions

[Thayer Young]

Two ways I can think of:
(I) If you use Web Mercator (EPSG 3857, coordinates in meters from prime meridian at equator)          or WGS84 projection (EPSG 4326, coordinates in degrees from prime meridian at equator)    or similar CRS that has straight meridians, you can do the calculations yourself and write the coordinates in a text file as well known text (see wikipedia for more detail) and import it into QGIS using the 'Delimited Text' option in the Data Source Manager.   In a text editor (Notepad, Text Edit, GEdit, etc.) write your details like the example below, where your field names are on the first line and your lines are on each additional line of text. Separate fields with commas, designate text with "double quotes".  Note that the x value does not change only the y, also note that the order is start point: longitude latitude, end point: longitude latitude:
 id, description, wkt1, "Prime Meridian", "LINESTRING(0.00000 -90.00000, 0.00000 90.00000)"2, "north of Baltimore", "LINESTRING(-76.61241 39.29068, -76.61241 90.00000)"
  Save it as text (not a Word document, .doc, and not an .RTF) with the extension .CSV. Import it into QGIS using the 'Delimited Text' option in the Data Source Manager. For the example set the coordinate system to 4326. Export the data into your desired CRS and format.

(II) You can use a plugin like those described here:
https://gis.stackexchange.com/questions/119133/how-to-draw-a-polygon-given-a-distance-and-bearing-in-qgis#119148

-Thayer
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Message: 6
Date: Mon, 9 Mar 2020 09:09:07 -0700
From: John Bethel <lt.bethel at gmail.com>
To: "qgis-user at lists.osgeo.org" <qgis-user at lists.osgeo.org>
Subject: [Qgis-user] Limit lines to orthogonal directions
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