Free tool
Do you have a plan in Lambert coordinates (AutoCAD or Covadis DXF file, list of points, marks from a land title plan)? The tool converts it into KML or KMZ for Google Earth, GeoJSON and CSV, computes the area of each closed outline, and can fit a non-georeferenced architect's drawing. It also works the other way: from a KML to Lambert coordinates. Everything happens in your browser.
Everything happens in your browser: your drawings and coordinates are sent to no one (only the background map images are loaded).
Choose a DXF file exported from your CAD or surveying software (AutoCAD, Covadis, BricsCAD, LibreCAD, QGIS…). Lines, polylines (with arcs), circles, arcs, ellipses, splines, points, texts and blocks are read; hatches are reported and ignored.
You can also drag and drop the file here. Up to 60 MB; the file is read in the background without freezing the page.
DWG is a proprietary format the tool cannot read, and neither can it read “binary” DXF. Save a copy as ASCII DXF:
Menu names may vary with the software version and language. If the drawing is in Lambert coordinates, keep them as they are: do not move or rescale the drawing before exporting.
Paste or import a list of points: name; X; Y; Z (optional); code (optional). Separator, decimal comma, header line and column order are detected; check them before loading.
One line per point. Accepted separators: semicolon, comma, tab, space, vertical bar. Coordinates in metres (Lambert, UTM, local grid) or in GPS degrees (decimal or degrees-minutes-seconds).
You can also drag and drop the file here.
Enter the boundary marks in order around the outline, using the keyboard. X and Y in metres (Lambert, UTM or local grid) or GPS longitude and latitude. The coordinate system is chosen in step 3.
Reverse direction: open a KML, KMZ (Google Earth) or GeoJSON file to see it on the map and get its Lambert coordinates (CSV) or a Lambert DXF for your CAD software.
You can also drag and drop the file here. KML folders become layers.
Useful when each point number is a text placed next to it (for example 1 for 1 m). Leave empty not to use it.
Lambert coordinates in the tables, the CSV and the DXF are given in this zone.
Your drawing uses a local grid (architect's drawing, dimensioned sketch). To place it on the map, match at least 2 points of the drawing (preferably 3 or more, well spread out) with their known coordinates: marks from a land title plan, points surveyed by GPS, or points picked on the satellite map (less accurate).
The similarity keeps shapes and angles: it is the right choice for a correct drawing. The affine transformation also corrects different scales in X and Y or a slight shear (distorted scanned drawing); with only 3 points it has no check at all.
Your settings and typed points are kept in this browser only (not the files); nothing is sent.
How to
Google Earth on the web is free to use in the browser, and Google Earth Pro for desktop is free too. Steps taken from Google's official help (updated 29 October 2026); menu names may vary slightly.
Open Google Earth (earth.google.com) and sign in. On the home screen, open an existing project; at the top left, “File” → “Import file to [project name]”, then “Upload from device” (or “Import from Drive”). Choose the KML or KMZ file; if prompted, select “Import as project features”.
Open Google Earth; at the bottom left of the home screen, click “Open local KML editor”, then “Open KML from device” and choose the file.
Open Google Earth Pro, click “File” → “Open”, choose the file type (or “All data import formats”), then the KML or KMZ file. The layers of your plan appear as folders in the “Places” panel.
Method
Reading the drawing: the DXF file is read in your browser, in the background. Blocks are expanded with their scale, rotation and nested blocks; polyline arcs (“bulges”), circles, arcs, ellipses and splines are split into 1° segments; texts are stripped of their formatting codes. A block with attributes (survey point, boundary mark) becomes a named point.
Systems: Morocco Lambert zones I to IV (Merchich datum, EPSG registry parameters), UTM WGS 84 zones 29 and 30 North (Krüger formulas, checked to the millimetre against the PROJ reference library) and GPS coordinates in degrees. The tool suggests the most plausible zone from the coordinate extent, without imposing it, and warns when a plan falls outside Morocco or looks like a local drawing.
Fitting a local drawing: from points with known coordinates, the tool computes a Helmert similarity (translation, rotation, scale) or an affine transformation, by least squares, and shows the parameters, the discrepancy at each point and the standard deviation. These discrepancies tell you whether the fit can be trusted.
Area: each closed outline is measured in Lambert with the shoelace formula (projected area, as on land title plans), as in the area calculator.
An exact calculation on wrong coordinates gives a wrong position: always check the result on the map.
Accuracy
The conversion from the Moroccan system (Clarke 1880 ellipsoid, Merchich datum) to Google Earth's WGS 84 uses the transformation published by EPSG, with a stated accuracy of about 7 metres; for zones III and IV, no specific official parameters are published. UTM and GPS coordinates are already in WGS 84 and do not go through this transformation. See the Lambert ↔ GPS converter.
Google Earth satellite imagery may itself be offset by a few metres from reality, and this offset varies from one image to another. A discrepancy of a few metres between your plan and the image is therefore normal; a discrepancy of several tens of metres or more points to a wrong zone, unit or system.
A KML is a visualisation: it has no legal value. For a boundary, a setting-out or a permit application, only a plan tied to the official geodetic network and drawn up by a surveying engineer is reliable. See cadastral and land title plans.
FAQ
The chosen system does not match the plan: wrong Lambert zone (zones I and II use the same X and Y values), wrong unit (plan in millimetres), X and Y columns swapped, or a plan drawn in local coordinates. Try the hypotheses suggested by the tool and keep the one that places the plan in the right spot; a local drawing must be fitted.
Ask for a DXF export, or open the DWG in software that can save it as ASCII DXF (see the explanations in the tool). If the drawing is not in Lambert coordinates, it will need to be fitted to at least 2 known points, ideally 3 or more.
Two points are enough for a Helmert similarity, but the fit then passes exactly through them and no error can be detected. With 3 or more points, well spread around the plan, the tool computes the discrepancy at each point and the standard deviation, which reveals a wrong point.
Yes: the marks on a land title plan are generally given in Lambert. Enter them in the “Enter boundary marks” tab or import them as CSV, choose the zone stated on the plan, and tick “Join the points” to get the outline and its area.
Arcs and circles are split into 1° segments, which very slightly underestimates the area of curved parts. Small differences may also come from rounding on the plan. The area is computed in Lambert, as on land title plans.
No. Files are read and converted in your browser; only the background map images are loaded from OpenStreetMap (and the satellite layer, if you choose it). Only your settings and the points typed on the keyboard are kept in this browser; the “Clear my data” button deletes them.
References
Formats, parameters and instructions checked on 30 October 2026.
Official help: import into a project, local KML editor, limits and accepted formats (updated 29 October 2026).
developers.google.com ↗GoogleGoogle Earth on the web, mobile and Google Earth Pro for desktop; end of Google Earth Pro downloads announced for 25 June 2027.
www.google.com ↗EPSG registryLambert conformal conic projection of zone I (zones II to IV: EPSG 26192, 26194, 26195).
spatialreference.org ↗EPSG registryTransformation between the Moroccan system and WGS 84, stated accuracy about 7 m.
epsg.io ↗EPSG registryUTM systems covering Morocco, used by GPS receivers and many GIS.
spatialreference.org ↗Journal of GeodesySixth-order Krüger series used for the UTM calculations.
doi.org ↗AutodeskObject coordinate system (OCS) of DXF entities, applied when reading.
help.autodesk.com ↗OGCFormat of the files produced for Google Earth (Placemark, Folder, Style, Polygon).
www.ogc.org ↗IETFStandard followed for the GeoJSON export (WGS 84, exterior ring anticlockwise).
www.rfc-editor.org ↗QGISOfficial QGIS documentation (Project → Import/Export menu).
docs.qgis.org ↗OpenStreetMapTerms of use of the OpenStreetMap background map.
www.openstreetmap.org ↗Need a georeferenced plan?
Topographic survey tied to the official geodetic network, fitting an architect's drawing on site, setting-out: we work with GNSS and total stations, in Morocco Lambert.