Open Open-Access Dataset162 Polder UnitsWGS84 EPSG:4326GEE Cloud Asset

Bangladesh Coastal Polders GIS & GEE Dataset

A standardized, open-access spatial vector dataset covering 162 coastal polders across Bangladesh, compiled, topologically cleaned, and published to Google Earth Engine by Md Minaruzzaman Shovon.

Derived from Bangladesh Water Development Board (BWDB) engineering records, this dataset standardizes coastal dike boundaries, administrative units, protected land area, and polder identification attributes (e.g., Polder 110, Polder 117). It provides hydrologists, coastal engineers, and remote sensing researchers with a ready-to-use cloud asset for Earth observation, CoastSat satellite shoreline tracking, storm surge modeling, and coastal vulnerability assessments.

Compiled & Published By:

Md Minaruzzaman Shovon

Primary Source Data:

Bangladesh Water Development Board (BWDB)

Primary Applications:

GEE Remote Sensing & CoastSat Analysis

Open GEE Asset Inspector Download Shapefile (.zip)BWDB Official Portal Item

Total Polders

162

Units mapped

Protected Area

12,314 sq km

Square kilometers

Embankments

5,017 km

Total dikes length

Coverage

4 Divisions

Coastal Bangladesh

Initializing Interactive Polder GIS Map...

Google Earth Engine Code Editor

Select an example workflow below to view clean, interactive code snippets.

Workflow Note: Load the complete BWDB coastal polders asset, center map on Bangladesh coastal belt, and display all 162 units.

ex0_script.js

Asset: users/minarsvn/bwdb_all_polders

// ============================================================

// Example 1: Load All 162 BWDB Coastal Polders

// Asset: users/minarsvn/bwdb_all_polders

// ============================================================

// 1. Load complete FeatureCollection

var allPolders = ee.FeatureCollection("users/minarsvn/bwdb_all_polders");

// 2. Print total count of polder polygons

print("Total Coastal Polders Count:", allPolders.size());

// 3. Center map view over Bangladesh coastal region (Zoom 8)

Map.setCenter(90.2, 22.3, 8);

// 4. Add layer displaying all 162 polders with cyan fill

Map.addLayer(allPolders, {color: '0ea5e9'}, "All 162 BWDB Polders");

Interactive Polder Directory

Explore all 162 polders. Search by Polder ID (e.g. P-110, P-117), name, or location.

Showing 162 of 162 poldersPage 1 of 14

Polder ID (GEE)	Polder Name	District	Upazilla	Area (km²)	Embankment (km)
P-1	Satkhira Sadar	Satkhira	Assasuni, Debhata & Satkhira	283.91	96.96 km
P-2	Satkhira Sadar	Satkhira	Assasuni, Satkhira	120.62	64 km
P-3	Kaliganj	Satkhira	Debhata, Kaliganj	179.01	64.4 km
P-4	Assasuni	Satkhira	Assasuni	100.83	80 km
P-5	Shyamnagar	Satkhira	Kaliganj, Shymnagar	552.57	192 km
P-6	Tala	Jessore,Khulna,Satkhira	Assasuni, Satkhira, Tala	234.2	53 km
P-7	PN-007	—	—	107.72	—
P-8	Shamnagar	Khulna,Satkhira	Assasuni,Shamnagar	37.26	34.25 km
P-9	Assasuni	Khulna,Satkhira	Assasuni.	109.39	60 km
P-10	Paikgachha	Khulna	Paikgacha.	10.44	8 km
P-11	Paikgachha	Khulna	Koyara, Paikgacha	167.44	67 km
P-12	Koyara	Khulna,Satkhira	Koyara	156.5	93 km

Page1of14

Frequently Asked Questions — Polders Map BD & BWDB GIS Data

Everything you need to know about accessing, citing, and using Bangladesh coastal polders vector data in Google Earth Engine and GIS software.

What is the Polders Map BD dataset?↓

Polders Map BD is an open-access spatial vector dataset covering 162 coastal polders across Bangladesh. Originally engineered by the Bangladesh Water Development Board (BWDB), this dataset standardizes polder embankment boundaries, protected land area (15,584 sq km), dike lengths (4,374 km), and administrative metadata (Districts & Upazillas) into WGS84 GeoJSON and Google Earth Engine (GEE) cloud format.

How does this compare to the official BWDB GIS Portal?↓

This dataset is compiled from primary engineering records hosted on the BWDB Official GIS Portal (Item 49ce94eab164459eaf471ea84f54c1e6) and ArcGIS REST Server (Mappolder4_MIL1). This open hub cleans polygon topology, standardizes attributes (e.g. PPBWDBNAME == 'P-110'), and makes the data cloud-ready for remote sensing workflows.

How do I load the BWDB Polders in Google Earth Engine (GEE)?↓

In GEE JavaScript Code Editor or Python ee SDK, load the public asset table ID:
var polders = ee.FeatureCollection("users/minarsvn/bwdb_all_polders");

Where can I download the raw Shapefile (.zip) or WGS84 GeoJSON?↓

You can download the full ESRI Shapefile ZIP archive via Google Drive Shapefile Download or fetch the web-optimized EPSG:4326 GeoJSON at /data/polders.json.