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Converting MUTM Everest Coordinate 1830 to WGS 84 using ArcGIS: Projection and Transformation

The Map Projection System used in Nepal is the MUTM (Modified Universal Transverse Mercator). Read more about Map Projection System in Nepal here.

In this exercise, I will be using ArcGIS. Other methods will be posted in the future.

  1. Load the data in MUTM. If you don’t have data yet, you can download from
CONTINUE READING

Make a simple landcover classification map using Regression Tree

The full code for classification after obtaining sample points is here. The full code for classification with sample points generated on the fly is here.

Note: This is a very simple method for generating Landcover maps meant for showing the basic workflow for generating Landcover maps. You can use more sophisticated algorithms like CONTINUE READING

Classifying the dynamics of the forest using the time-series

In this post, we will use the datasets from UMD (Tree Canopy Cover [TCC] and LOSS layers) to calculate and classify the dynamics of the forest. The TCC is available from 1988 and LOSS layers are available from 1989. Here we will be calculating different forest dynamics. Use the final assemblage using this link or … CONTINUE READING

Generation of High-Resolution DSM Using UAV Images

Generating High-Resolution DSM often demands highly accurate data. Among the range of terrestrial and aerial methods available to produce such a dataset, this project tests the utility of images acquired by a fixed-wing, low-cost Unmanned Aerial Vehicle (UAV). The data processing of UAV images has been carried out using the algorithms ranging from classical photogrammetry … CONTINUE READING

Assessment of time since forest disturbance

In the assessment of time since forest disturbance, we define disturbance as the drop of TCC from =10% to 0%. Use following code or the link here.

Happy Earth Science ūüôā… CONTINUE READING

Making Forest Rotation Map

Rotation of the forest is defined as the number of forest disturbance events for the year range, with disturbance defined as a drop of Tree Canopy Cover from >=10% to 0%, or the loss from 1 to 0.

The pseudo-code for the rotation map can be written as:

We travel time for 3 years and … CONTINUE READING

Calculate the amplitude of datasets over a time-series

With the Google Earth Engine, it’s very easy to calculate the amplitude of any time-series datasets. The amplitude in wave physics is defined as the distance between the high and the low peak as shown in the picture below. Similarly, for any raster datasets for a time series, the amplitude is the difference of the … CONTINUE READING

Get Primary Forest Map using the Tree Canopy Cover

The primary forest can be mapped in a number of ways. One of them is described here,¬†where the¬†base year 2000 map for the primary forest is used in relation with the forest definitions on tree canopy cover (tcc) and tree canopy height (tch) to calculate the primary forest in each year. Turns … CONTINUE READING

Mapping Primary Forest using UMD datasets

GLAD at UMD provides the primary forest for 2000 which is the base map for most of their analysis. This primary forest consists of natural long-lived forest extent. The mapping and definition for the primary forest are based on the methodology as described in the paper for humid tropical forests and modified to include dry … CONTINUE READING

Remapping National Land Use Land Cover (LULC) to Forest Resources Assessment (FRA) and Intergovernmental Panel on Climate Change (IPCC) classes

Land cover maps play an important role in decision making regarding land use, agriculture and food production, maintaining the ecosystem, and natural resource management, etc.

The National Land Use Land Cover (LULC) categories are usually more detailed and have more classes than the classes suggested by the Intergovernmental Panel on Climate Change (IPCC) and the … CONTINUE READING

Calculating the Standing Age of the Forest in the Mekong Region using the Google Earth Engine

The age of the forest is the time since forest (re)-establishment. Forest (re)-establishment is defined as the year where TCC reaches certain threshold as specified by country definition. The output value is years since forest establishment for pixels defined as forest in the year 2018.

The scripts look like below or use this link.… CONTINUE READING

Calculating First and Last Disturbance from UMD Dataset using Google Earth Engine

The GLAD UMD dataset on the TCC can be found here. The TCC and Loss datasets are prepared by GLAD UMD utilizing different input datasets and algorithm. So the forest disturbance can be calculated from both datasets. We will be calculating the first disturbance by combining them.

The first disturbances are the first year … CONTINUE READING

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