Saved LiDAR fields and DEMs

Every field you prepare is saved on the tablet with its boundary, its layers and, if you asked for it, its LiDAR elevation surface (DEM). The list of them is called My LiDAR Fields. It works offline, so open it in the cab on the module Wi-Fi.

Before you start

Time: a minute or two.

• At least one field is prepared on this tablet (Prepare a field).
• No internet needed.

Open My LiDAR Fields

From a survey or grade map:

1. Tap the layers button

   The dark square button with a blue stacked-sheets icon, at the bottom right of the map. A window called Map Layers opens.

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2. Tap +

   In the top-right corner of the Map Layers window: a green plus sign. A menu opens.

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3. Tap My LiDAR Fields

   The fifth line of the menu. A window called My LiDAR Fields opens.

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From Home:

1. Tap LiDAR & Mapping

   The bottom-right card on the Home screen. A window called LiDAR & Mapping opens with five choices.

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2. Tap Saved Fields / DEMs

   The last of the five choices. The LiDAR map opens in view mode, with the hint View mode · open Saved Fields to load layers, and My LiDAR Fields opens on top. No internet check: it works offline.

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Closed the list by mistake? In view mode, tap Saved Fields… in the column down the right side to open it again. (The label is Saved Fields / DEMs, cut short on screen.)

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With nothing saved yet, the list reads No saved fields yet. Use the LiDAR Mapping workflow to generate one.

Open a field's row

Each row has the field name and a line like 251 ac · 2.8 m/px · US: size, LiDAR detail and source (US, CANADA, or IMAGERY for an imagery-only field).

1. Tap the arrow at the right end of the row

   A small down arrow. The row opens.

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The opened row shows:

• A detail line adds DEM saved when the field has a saved DEM and imagery cached when its imagery is on the tablet, for example 251 ac - 2.8 m/px - DEM saved - imagery cached - US.
• A tick box per layer: Boundary, Flow Routes, Ponding Risk, Depressions. Tick to put it on the map, untick to take it off.
• Sliders under Ponding Risk and Depressions while they are ticked: Opacity (ponding starts at 100 %, depressions at 80 %) and, for ponding, the Ponding cutoff between Wet last and Wet first. See Read the drainage layers.
• Drainage Planner, on fields with flow lines made on v1.5.4 or later. See Drainage Planner.
• Delete, in red.
• Job failed (DEM retained) with a warning sign when processing failed. The elevation is kept so support can look at it.

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Put a field's layers on the map

1. Tap a layer's tick box

   In the opened row: Boundary, Flow Routes, Ponding Risk or Depressions. The layer draws on the map behind the window at once. Tap again to take it off.

   You should see sliders open under Ponding Risk and Depressions once they're ticked: Opacity, and for ponding the Ponding cutoff too (Change opacity and the cutoff).

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2. Close the window

   Tap the X in its top-right corner. The layers stay on the map until the app closes.

Delete a field

1. Open the field's row

   Tap the arrow at the right end of the row, as above.

2. Tap Delete

   The red button at the bottom right of the opened row. The app asks, for example, Delete North 80? This removes all layers and files for this field.

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3. Tap Delete in the question

   A small window asks Delete North 40 Demo? (with your field's name). Tap Delete, the right-hand of the two green words at the bottom. The field disappears from the list, and its layers come off the map. Changed your mind? Tap Cancel.

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Reuse the saved DEM offline

A field with DEM saved gives these workflows a ground surface without internet:

Generating contours needs a connected control module or an activated Ditch Assist Lite receiver. A DIG™ module or a Bluetooth GPS can't generate or follow contours. The steps below use Levee; Contour Tiling and Contour-Guided Terracing have the same Saved LiDAR DEM button in their own data-source step.

1. Open Levee and connect

   On Home, tap the Levee card and connect to your kit (Connect to your kit). The Contour Guidance choices appear.

2. Tap Use Existing Data

   The second choice. The Levee screen shows its Contour Guidance panel.

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3. Tap Saved LiDAR DEM

   The blue-green button under Or use existing data, fourth from the left. A list called Saved LiDAR DEM opens.

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4. Tap the field

   Each field is listed with its size and detail, for example 251 ac · 2.8 m/px. A window called Contour Settings opens.

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5. Tap Generate

   Contour Settings shows the DEM size and elevation range, the contour interval (3 in by default) and smoothing. Leave them unless you know you need others, and tap Generate at the bottom right. Then carry on as the workflow guide says (Levee contours).

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No saved DEM yet? The app says No saved LiDAR DEMs found. Use LiDAR & Mapping while online to save one first. Prepare the field at home (Prepare a field) or use a field survey instead.

Good to know

• Layers you tick go on the map until the app closes. Next session, tick them again.
• Fields are kept in Documents/DitchAssist/lidar-fields/, one folder per field plus a fields.json list. Always delete fields in the app, not with a file manager, so the list stays right.
• With Field Mode on, new LiDAR fields are tagged to the active field like your surveys and jobs.