Digital Terrain Model (DTM) is a cartographic model that includes a logical-mathematical description of the terrain objects in digital form and contains data about their characteristics. DTM is created in the established map projections, scale, coordinate systems, and elevation systems, taking into account the principles of cartographic generalization and establishing necessary topological relationships between objects.
Digital Terrain Model (DTM) is a digital cartographic model that contains data about terrain objects and their characteristics.
The digital terrain model should be constructed in a way that independent models can be derived from it using established symbolic conventions for topographic maps, including:
- terrain relief;
- communication networks;
- buildings and structures;
- soil and vegetation cover.
Для чего нужно
Цифровая модель местности необходима для картографирования и обустройства площадок при проектировании ландшафтного дизайна, зданий, сооружений, автомобильных дорог, магистралей, развязок. Для решения задач по охране территории, проведения научных исследований.
Отличия ЦМР/ЦМП от ЦММ
ЦММ включает в себя цифровые слои (модели) (рельефа, вектора (объекты с семантическими характеристиками), распространения населения (административные границы, границы населенных пунктов с численностью жителей согласно последней переписи населения), препятствий (высоты зданий, растительности и инженерных сооружений)).
ЦМР содержит информацию о высоте только истинного рельефа, без учета растительности, зданий и других антропогенных объектов, ЦМП содержит информацию о всех неровностях земной поверхности, включая растительность и антропогенные объекты.
You can order from us
The purpose of creating a Digital Terrain Model (DTM) is to graphically represent spatial and coordinate information, and provide a description of the codes and symbols used in a specified area.
Digital terrain models are used to solve the following tasks:
- As an up-to-date digital map of any scale and purpose for solving cartographic tasks.
- In the creation and updating of digital topographic maps and plans.
- As part of the information support for geographic information systems (GIS).
- As a cartographic base for automated cadastral systems of various purposes.
- As a cartographic base for navigation and positioning systems.
- As part of the information support for planning mobile telephone network systems.
- For spatial referencing of thematic databases resulting from engineering surveys, land cadastral works, land surveying, statistical research, and other specialized works and surveys.
Advantages of Remote Sensing Data
Advantages of satellite imagery for creating DTM:
Satellite imagery of very high and high resolution can be obtained more quickly as they may already exist in operator archives, and new imaging does not require coordination with competent authorities.
Advantages of aerial photography for creating DTM:
Aerial photography allows for obtaining images with high spatial resolution (up to 1 cm/pixel) and provides a higher level of detail in the resulting orthophotoplans and models. It achieves a root mean square error (RMSE) of point coordinate determination of less than 10 cm, and can be performed below continuous cloud cover. Aerial photography is recommended for creating high-precision DTM.
Advantages of unmanned aerial vehicle (UAV) imagery for creating DTM:
The use of UAV imagery for building digital terrain models (DTM) significantly expands the possibilities for studying space and obtaining information about it. It allows for obtaining a realistic and high-quality model in a compressed timeframe, comparable to laser scanning but more cost-effective.
Advantages of LIDAR for creating DTM:
- High speed and accuracy of measurements.
- The ability to use the acquired data to create maps, topographic plans, and drawings, including various cross-sections.
- The ability to remotely survey inaccessible and dangerous objects (the range of the laser scanner depends on the instrument's characteristics and survey conditions, ranging from 1 to 2,500 meters).
Using a high-resolution camera, a coordinate array can be obtained simultaneously with real images, which is a significant advantage in DTM construction.
Prices for services
The cost of execution is calculated on an individual basis, taking into account a specific of task.
After receiving the task description, we calculate the cost and send you a commercial offer.
Period of execution
Creation of DTM
The deadline for completion of work is from 25 (twenty-five) working days from the date of receiving the advance payment, calculated individually for each customer.
The timeframe for completing the work depends on the total area, the amount of remote sensing materials to be processed, their type, and is calculated individually for each customer.
Delivery of Finished DTM
The timeframe for providing the service is from 10 (ten) working days from the date of receiving the advance payment, calculated individually for each customer.
How to place an order:
- Step 1: Submit an application on the website, providing the following information:
- Mapping area (coordinates, name of the region, district, shapefile, etc.);
- Requirements for the created/finished digital terrain model;
- Requirements for remote sensing data, availability of source cartographic materials, additional and reference data;
- Deadline for completion of work.
- Step 2: Agreement on the technical specifications and cost:
- Purchase of remote sensing data, images are paid separately (from $8 to $200 USD per 1 km2 depending on the type of imagery: archival, new, mono-stereo, resolution);
- Agreement on the work methodology and requirements for the produced deliverables.
- Step 3: Contract signing and commencement of work:
The start date of the work for creating the DTM for decoding and vectorization is within 5 working days from the date of receiving 100% advance payment for the remote sensing materials. Payment is made only by bank transfer. The decoding and vectorization of objects start within 3 working days after the start of DTM creation.
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Stages of service provision
Stage 0 (Before Contract Signing):
- Identify the tasks that require the use of a digital terrain model;
- Familiarize yourself with the area of interest (size and characteristics of the terrain);
- Agree on the accuracy requirements for the deliverables;
- Preliminary selection and verification of archival images to meet the requirements for the deliverables;
- Plan for new imagery if necessary;
- Determine the availability of cartographic products from the client or public and private archives for updating or creating digital terrain models;
RESULT: Feasibility of providing the service (YES/NO)
Stage 1 (Before Contract Signing):
- Agree with the client on the remote sensing data available in the operator's archives or order new imagery;
- Determine the work methodology and agree with the client on the execution methods and timelines;
- Agree with the client on the projection, coordinate systems, and height systems for the created or updated digital terrain models;
- Agree with the client on the additional data that should be included in the created digital terrain models;
- Agree with the client on the Technical Task for the entire scope of work;
- Determine the labor costs, costs for remote sensing materials, additional and reference data, and agree on the delivery timelines and total cost of work.
RESULT: Signed contract
Stage 2 (Contract Execution):
- Receive advance payment (100% prepayment for the acquisition of remote sensing materials);
- Order remote sensing materials (conduct new imagery), order data from public and private archives, collect and analyze additional and reference materials;
- Prepare, agree on, and approve editorial and technical instructions for the creation or update of digital terrain models;
- Perform quality control of remote sensing materials;
- Create digital orthophotoplans necessary for the creation or update of digital terrain models;
- Decoding of orthophotoplans (thematic processing of remote sensing data) and vectorization of terrain objects to create digital terrain models;
- Perform visual and automated quality control of the produced deliverables;
- Export the created or updated project to the required formats, projection, and coordinate system;
- Prepare a technical report.
The result of the provision of services
As a result, the client receives a digital terrain model (DTM) of the specified type to solve their specific tasks.
The most common types of digital terrain models include the Digital Elevation Model (DEM), Clutter Model, Vector Model, Address Database, orthophotoplans, additional reference materials, and a technical report.
The digital terrain models are provided in formats compatible with software such as ASSET, ATOLL, Mapinfo, etc. (according to the client's requirements specified in the technical task).
All deliverables are provided on electronic media or via the Internet through FTP servers, and textual materials are also duplicated in printed form.
Requirements for Source Data
In order to perform the preliminary work effectively, the following information needs to be provided:
- Coordinates of the mapping area (in any convenient format);
- Type of digital terrain model to be created or updated, format of representation, desired scale, projection, coordinate system, and height system;
- Availability of source cartographic materials, additional reference data;
- List of coordinate points for photogrammetric processing of remote sensing data;
- Requirements for the object composition and thematic information of the data project to be created or updated;
- The need for the development and approval of Editorial and Technical Instructions for the creation or update of the data project.
- Location of interest (location/coordinates of the object in any convenient format, and the area of the object);
- Specific task that needs to be addressed using the DTM.
- The main source of data for creating or updating the data project is the existing remote sensing data materials available in the archives of satellite operators, up to the most current date. Alternatively, new imaging can be commissioned.
- Additional and reference materials such as geographical descriptions, maps, atlases of larger or smaller scales, directories, and any data available to the client are utilized in the creation or updating of the data project.
- Existing cartographic products from public and private archives or cartographic products provided by the client can be used as the basis for updating the DTM.
- The timeframe for creating a digital terrain model based on satellite or aerial imagery data depends on the volume and complexity of the order. The minimum timeframe is 25 (twenty-five) working days.
- The delivery timeframe for the completed digital terrain models is 25 (twenty-five) working days.