Recent evaluation of satellite tv for pc imagery specializing in rice cultivation within the Ansok Tideland, situated in Ongchon County, South Pyongan Province, has revealed a regarding pattern. Many rice stalks seem stunted and have didn’t take root correctly. This stunted progress could also be attributed to hasty rice planting regardless of inadequate desalinization of the soil following seawater flooding.

The Ansok Tideland gained consideration in August 2023 when Typhoon Khanun prompted important injury, leading to a dike collapse that submerged an space greater than twice the scale of Seoul’s Yeouido district. In response, North Korean authorities repaired roughly 100 meters of the collapsed dike, drained the flooded space, tried to desalinate the soil, and reestablished rice fields. Despite these efforts, satellite tv for pc imagery evaluation signifies that rice seedling progress stays irregular, seemingly as a result of insufficient salt removing from the soil.

The satellite tv for pc information is from the European Space Agency’s (ESA) Sentinel-2 satellite tv for pc (10-meter decision). North Korea could have rushed to reap rice within the much less flooded Ansok Tideland space, the place the autumn rice harvest is predicted to be poor. The fiery wrath of Kim Jong Un, who visited the area in the course of the flooding brought on by the storm, could have spurred officers to hurry to revive the rice fields and transplant rice. Ultimately, this 12 months’s fall harvest will show how profitable these efforts have been.

Ansok Tideland’s rice paddies should not doing nicely

North Korea’s rice planting within the Ansok Tideland in Ongchon County, South Pyongan Province, which was flooded by a storm final summer time, was discovered to be affected by poor progress. Imagery=Sentinel-2

Sentinel-2 imagery captured on June 3 reveals that rice planting within the Ansok Tideland paddy fields was largely full, with only some dry fields remaining. The imagery exhibits the attribute greenish-blue hue of wholesome paddy fields in a number of areas, indicating regular progress of rice seedlings over the previous days.

However, a subsequent picture taken on June 13 presents a regarding improvement. In the center-left portion of the picture, an irregular blue coloration is obvious, as if there was localized flooding throughout the tideland. This coloration signifies that younger rice seedlings are seemingly failing to ascertain root programs and are as a substitute floating on the water’s floor. This uncommon phenomenon could also be attributed to residual salinity within the soil, a consequence of insufficient desalinization following the seawater inundation.

The 10-meter decision Sentinel-2 satellite tv for pc picture is unable to differentiate the main points of the floating rice seedlings. This is inferred from the truth that the colour of the rice fields shouldn’t be a wholesome brilliant inexperienced, however quite a flooded, blue coloration, which means that the seedlings are floating and thus misplaced. In a couple of locations, the rice seedlings have pale to a grayish coloration. As they’ve shifted from a wholesome inexperienced coloration to grey, the seedlings seem to have didn’t develop correctly.

To discover out extra in regards to the situation of the rice planting within the Ansok Tideland, I performed a normalized distinction vegetation index (NDVI) evaluation. The NDVI is an index that signifies the vitality of floor vegetation and is broadly utilized in satellite tv for pc picture evaluation. For the evaluation, the vegetation index was calculated from the pictures of June 3 and 13, after which a change evaluation was carried out to test how nicely the rice was rising within the tideland’s rice fields. The ERDAS IMAGINE program was used to course of and analyze satellite tv for pc photographs, and NDVI Differencing was used within the analytical course of. A thresholding worth of 1.0 commonplace deviation was utilized to differentiate between good, honest, and poor rice progress circumstances.

Results of the NDVI evaluation

rice, satellite
According to NDVI evaluation, 27% of the world, greater than 1 / 4 of the Ansok Tideland, was discovered to have poor rice progress. The rice seems to be failing to develop correctly as a result of inadequate desalination. Imagery=Sentinel-2

Based on the NDVI evaluation, solely 280 hectares or 47% of the 603 hectares of restored areas within the Ansok Tideland have been discovered to have regular rice progress. On the opposite hand, 27% or 166 hectares have been discovered to have poor rice progress, whereas the remaining 26% or 157 hectares have been discovered to be in good situation. In 27% of the world, greater than 1 / 4 of the Ansok Tideland, rice vegetation have been discovered to be unable to develop usually, which can be as a result of extreme rice harvesting with out correct removing of saline seawater. This signifies that the harvest within the Ansok Tideland will fall far wanting targets in the course of the fall harvest.

In addition, the evaluation discovered {that a} 423-hectare reclamation space is deliberate subsequent to the Ansok Tideland, the place dikes have been constructed to retain water. This space may additionally be drained of seawater and reclaimed for brand spanking new rice fields. At the decrease finish of the Ansok Tideland, there’s a 940-meter extension of the seawall, which can be used as a part of North Korea’s “Seeking New Land” reclamation efforts which might be geared toward addressing the nation’s scarcity of arable land.

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