Everything you need to run a job in MyJa Studio — from the coordinate abstract to the printed sheet. Written for surveyors, not for developers. Skim the section you need; ignore the rest.
MyJa Studio has three workspaces — Computation, Area, and Cartography. The order below is the order that works. You can jump straight to Area if you only need parcel areas, or straight to Cartography if you only need a sheet. But for a fresh JRJ, do it in this sequence.
Press NEW JRJ in the top navigation or on the welcome page. Fill in every field marked with an asterisk: County, District, Estate, Block, Plot, Purpose of survey, Field Surveyor Name, 10-digit Contact, and Coordinate Reference System. The email field is optional.
County and District are searchable lists — type the first few letters
and pick from the dropdown. The Contact must be exactly 10 digits, no
spaces, no +256 prefix.
Pick how many known datum controls frame your traverse. This decides which rows of your abstract become the fixed controls:
| Method | How the abstract maps to controls |
|---|---|
| Two | CM1 = first row, CM2 = second row |
| Three | CM1, CM2, CM3 = first three rows |
| Four | CM1, CM2 = first two rows. CM3, CM4 = last two rows. |
| Six | CM1–CM3 = first three rows. CM4–CM6 = last three rows. |
You can switch the count later from inside the computation workspace without re-uploading anything.
Drop a CSV or XLSX on the dropzone. Format rules are in section 2. The app reads the first sheet only. Minimum six valid points.
Press COMPUTE JRJ. The app calculates the datum, then produces the link traverse. Two modes:
After compute, review the metrics, the closure table, the field notes, and the traverse map. Fix anything that looks wrong and recompute.
Switch to AREA COMPUTATIONS. Upload a DXF of closed parcel polylines. Turn on INTERACTIVE SELECTION and tap parcels on the drawing. Selected parcels appear in the left rail with their areas, and the residue against the outer boundary is calculated live.
Rename any parcel by typing in the left rail. The name flows through to the area schedule, the vertex schedule, and the cartography sheet.
Switch to CARTOGRAPHY. The DXF carries over from Area Computations automatically. Pick the CRS (this is the coordinate reference system the survey was computed in), choose the paper size, set the scale, and configure the layers.
The seven rail panels on the left correspond to seven things you can change: the DXF source, the CRS, the map sheet, the coordinate grid, the design elements, the annotations, and the export quality. Edit any of them and the live map on the right updates.
From Computation you can export the JRJ report as PDF or XLSX. From Area Computations you can do the same — the export includes both the traverse and the area schedules. From Cartography you export the cadastral sheet as a PDF at the paper size you selected.
Three columns, in this order:
| Column | Content | Example |
|---|---|---|
| 1 | Station name (text) | CM1 or KLA001 |
| 2 | Northing (number) | 10450.235 |
| 3 | Easting (number) | 312000.500 |
A header row is allowed but not required — non-numeric rows are skipped automatically. The minimum is six valid points. Duplicate station names are rejected with an error, because two stations sharing a name would break the traverse chain.
The parser reads these entity types:
| Entity | How MyJa Studio treats it |
|---|---|
LWPOLYLINE, POLYLINE |
Closed ones become parcels. Open ones are virtually closed (see FAQ). Fewer than 3 vertices becomes a reference line. |
TEXT, MTEXT |
Read as labels. A label whose anchor sits inside a parcel becomes that parcel's name. |
LINE |
Drawn as a dashed grey reference line. Not selectable. |
ARC, CIRCLE |
Sampled into a polyline and drawn as a reference line. |
SPLINE |
Drawn from fit points (or control points if fit points are missing) as a reference line. |
| Everything else | Ignored. |
Reference lines are drawn in the preview and on the cartography sheet, but you cannot select them, and they do not contribute to any area. They are context — road edges, streams, existing boundaries — not parcels.
| Key | Action |
|---|---|
| + or = | Zoom in |
| − or _ | Zoom out |
| F | Fit the whole page or map |
| Ctrl+Z | Undo (Cmd+Z on Mac) |
| Ctrl+Y | Redo (Cmd+Y on Mac) |
| Ctrl+Shift+Z | Redo (alternate) |
| Esc | Dismiss popovers and pickers |
| Key | Action |
|---|---|
| Alt+A | Go to Area Computations |
| Alt+C | Go to Cartography |
| Alt+T | Scroll to the traverse results |
| Alt+W | Back to Welcome |
All Alt-key shortcuts are ignored while the cursor is in a text field, so typing never triggers navigation.
The polyline was not closed in the DXF. The app reports this in the UNCLOSED POLYLINES panel on the left rail and virtually closes it — a straight line from the last vertex back to the first — so an area can be calculated. Turn the row off in the panel to exclude that polyline from area computation entirely.
A straight edge drawn between the last and first vertices of an open polyline, so the shoelace area formula has a closed ring to work with. It is what the app uses in place of the boundary segment that was missing from the DXF. It is correct if the missing segment really is a straight line. It is wrong if the missing segment follows a curve or another parcel. When in doubt, close the polyline in CAD and re-upload.
It is determined by the survey, not by the app. A two-control link traverse is the common case — CM1 and CM2 at the top of the abstract, everything between them computed. Three, four and six control configurations exist for surveys framed by more known points. If you are unsure which your job needs, check the survey instructions or ask the supervising surveyor.
Coordinate mode derives everything from the uploaded coordinates. The result is exact by construction — it is a computed layout, not field data. Total-station mode takes the FL/FR readings, slope and zenith you enter from your field book and adjusts the traverse using Bowditch or Transit rules. Use total-station mode when you have real field observations. Use coordinate mode when you want to check a known layout.
Residue = outer boundary area minus the sum of every parcel inside it. If the residue is negative, either the outer boundary does not contain all parcels, or a parcel is being double-counted, or a hole was not detected. Check the outer boundary selection in the Drawing Setup panel and check the warnings for any negative residue alerts.
The hole detection rule requires that the inner polyline has no TEXT or MTEXT label of its own. If the inner island is labelled, it is treated as an independent parcel, not as a hole in the parent. This is intentional — a labelled island is usually a real plot, not excluded ground. If you need it treated as a hole, remove the label from the DXF and re-upload.
Yes. Open SAVED JOBS, load the job, make your changes, and press SAVE JOB again. You will be asked to confirm overwriting the existing saved copy.
It carries the job metadata and the export date as plain text. Scan it and you see the job details, the slogan, and the export date. It does not link to a website — MyJa Studio does not host your data anywhere publicly. It is a printed record, nothing more.
Yes, until you sign in. Everything runs in the browser and saves to your device first. Signing in adds cloud sync across devices, but the app continues to work offline after that — jobs are held locally and pushed to the cloud when the connection returns.
Sign in with the same Google account on both devices. Jobs sync
automatically. If you want to move them without signing in, open
SAVED JOBS and press EXPORT on the
first device, then IMPORT on the second. That
produces a single .json file containing every saved
job.
The app loads the ExcelJS library on demand the first time you export. If the connection drops during that load, the export fails. Reload the page and try again — the library is cached after the first successful load.
Those are reference entities — LINE, ARC,
CIRCLE, SPLINE, or polyline segments with
fewer than three vertices. Roads, streams, existing boundaries, and
anything else drawn as a line or curve. They are shown for context
but cannot be selected and do not contribute to any area. You can
turn them off in Cartography under MAP DESIGN →
Roads & reference lines.
Both, if they physically sit on top of each other. Tap once and the app lists every polygon under the cursor — pick the one you want. Hold Ctrl or Alt while clicking to cycle through the stack without the picker appearing.
What changed, and when. Newest first. Every entry is dated; nothing is auto-generated.