Home | Links | ©| Contact Us

Killala Bay

Overview

Killala Bay is situated between County Mayo and County Sligo in the northwest of Ireland.

 

Back to Top

INFOMAR Survey History

In 2002 the Celtic Voyager surveyed a large portion of the deeper waters of outer Donegal Bay as part of a larger survey area extending west to Erris Head, Co. Mayo. In early 2008, the Celtic Voyager was again used to survey the areas close to the coast all around Donegal Bay.

Coverage from survey legs of Killala Bay.(Click image for more detailed map).

Survey Coverage polygons can be downloaded as a shapefile from our Interactive Web Data Delivery System (IWDDS).

Select your area of interest. Vector datasets - Offshore - Offshore Shapefiles

Back to Top

Shaded Relief

The 3D appearance is achieved using software called Fledermaus. By using some vertical exaggeration, artificial sun-shading (usually as if there is a light source in the nw 315°) and colouring the depths using various colour maps, it is possible to highlight the subtle relief of the seabed. This helps us to quickly understand the variation in depths.

MBES shaded relief overview image of the area mapped in Killala Bay and approaches. (Click image for more detailed map)

Download Shaded Relief Bathymetry Geotiffs from our Interactive Web Data Delivery System (IWDDS)

Select your area of interest.Offshore Geotiffs - Bathymetry Shaded Relief Geotiffs.

Select your area of interest. Offshore Geotiffs - Lidar Shaded Relief Geotiffs.

Back to Top

Backscatter

Multibeam Systems also collect additional information, including the strength of the acoustic signal (or return) from the seafloor. This is known as Backscatter. Differing seafloor types, such as mud, sand, gravel and rock will have different Backscatter values depending on the amount of energy they return to the sonar head. Rocky areas will typically have high returns while soft sediments like mud are more likelyto absorb energy and have low Backscatter returns. These differing values are used to generate a grey-order image (i.e. dark for high returns, bright for low returns) of the seabed which can be used to examine the nature of the seafloor.

In the backscatter image above we can see how the low reflectivity material represents the mobile soft sediment on the bay and the high reflectivity material darker in colour represents the bedrock outcrops.

Download Backscatter Geotiffs from our Interactive Web Data Delivery System (IWDDS)

Select your area of interest.Offshore Geotiffs - Backscatter Geotiffs.

Back to Top

LiDAR

The Lidar survey was carried out by Tenix LADS Corporation Pty. Ltd in October 2003.

To view and navigate around the Lidar Killala Bay dataset in Google Earth, click here

Image of Lidar data for Killala Bay in Google

Bathymetry and shaded relief charts of the Lidar coverage can be downloaded here.

 

Download Shaded Relief Bathymetry Geotiffs from our Interactive Web Data Delivery System (IWDDS)

Select your area of interest.Offshore Geotiffs - Lidar Geotiffs.

You can download Lidar xyz data from IWDDS

(Data Type: Vector Datasets, Region: Offshore, Theme: Lidar.

You can also download the Lidar data in ArcGIS GRID format

Back to Top

Ground Truthing/Seabed Sampling

To verify the results of remotely sensed sonar data, it is important to collect physical sediment samples from the seabed. These may be from the surface where grabs are used or may penetrate through the seabed and retain the vertical structure of the sediment by using various coring methods. These samples are also critical for the confirming seabed classifications.

A small number of seabed samples were taken in 2005 by the RV Celtic Voyager in Killala Bay (blue circles). 

Sample taken by the RV Celtic Voyager in 2005.

20 samples (green triangles) were taken in Killala Bay in 2011 by Aquafact. Most of the samples were Sand. Full Particle Size Analysis (PSA) was carried out on the samples.

Complete map of sampling locations of the northwest coast of Ireland including Killala Bay and Approaches with a variety of sampling instruments. (Click image for more detailed map)

Sample locations can be downloaded as a shapefile from our Interactive Web Data Delivery System (IWDDS).

On the IWDDS Select your area of interest. Vector datasets - Offshore - Offshore Shapefiles

Back to Top

Geology

Onshore Bedrock Geology shapefiles can be downloaded from our Interactive Web Data Delivery System (IWDDS).

On the IWDDS Select your area of interest. Vector datasets - Onshore - Bedrock

Offshore Geology shapefiles can be downloaded from our Interactive Web Data Delivery System (IWDDS).

On the IWDDS Select your area of interest. Vector datasets - Offshore - Offshore Shapefiles

Back to Top

INFOMAR in Google Earth

Image of Lidar data for Blacksod Bay in Google

Download the bathy lidar Donegal Sligo Killala 10m dataset.

To view additional datasets in Google Earth please click here

Back to Top

View data in the free iView4D

Download the free viewer here

Download the bathy lidar Donegal Sligo Killala 10m dataset here

Back to Top

Data Access

Full details outlining the process to gain access to datasets for the bay above or all INFOMAR data can be found in the INFOMAR | Data page of this website.

Back to Top

Return to Survey Details Map

Follow these links to your area of interest on the INFOMAR website:

About | Surveying | Data & Products | News & Updates | Press Releases | Publications | Associated Projects | Image Gallery | Contact Us | Home

Find Us
Geological Survey of Ireland Geological Survey, Ireland
Beggars Bush, Haddington Road
Dublin 4
Marine Institute Marine Institute Headquarters,
Rinville, Oranmore
Co. Galway
The National Development Plan
a modus site