## Menukar sistem koordinat menggunakan ArcGIS

Bila dapat shp files dari client dalam sistem koordinat kertau, mesti pening kepala. Mananya tidak, saya adalah pengguna QGIS dan function “on the fly” CRS transformation dalam QGIS sangat tidak membantu, berbanding function yang sama dalam ArcGIS. That why, ArcGIS sangat disukai oleh ramai orang sebab lebih muda berbanding QGIS. Tetapi, since ArcGIS perlu dibeli dan … Read more

## Climate Extremes Indices (Re-post)

I obtained a good post (link) on the climate extremes indices. The post as follows: Currently, the ET recommends 27 core indices (the ‘ETCCDI’ indices) that are calculated for the globe using the  RClimDex/FClimDex software. Definitions of the 27 core indices FD, Number of frost days: Annual count of days when TN (daily minimum temperature) … Read more

## Calculate Flood/Rainfall Frequency from cumulative distributionfunction (CDF) of the distribution

Specifically, we will use the cumulative distribution function (CDF) of the fitted distribution to calculate the annual exceedance probability (AEP), or the probability that the event is equaled or exceeded in any single year. For example, considering a 200,000 cfs level, the exceedance probability is calculated in the following way: Exceedance_P = P{X≥200} = 1 … Read more

## Exceedance Probability

Introduction Sometimes a hydrologist may need to know what the chances are over a given time period that a flood will reach or exceed a specific magnitude. This is called the probability of occurrence or the exceedance probability. Let’s say the value “p” is the exceedance probability, in any given year. The exceedance probability may … Read more

## Source of General Circulation Models

I obtain several questions regarding to the SDSM model. Here some of questions: Am writing this email from Ethiopia and am doing my thesis work regarding impact of climate change on hydrology. am pleased to ask you about climate scenarios where to download like HadCM3 A2 and B2. Currently am planning to use SDSM-DC 5.2, … Read more